TrojanSpy.Win32.BOBIK.AA
Trojan-Spy.Win32.Bobik.cks (Kaspersky); Troj/Mdrop-IYP (Sophos); Trojan.Win32.Generic!BT (Sunbelt)
Windows
Threat Type: Trojan Spy
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan Spy arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Arrival Details
This Trojan Spy arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan Spy adds the following processes:
- "{malware file path and name}"
- %System%\cmd.exe /c "echo %SystemRoot%"
- %Windows%\system.exe
- "%Windows%\system.exe"
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It creates the following folders:
- %User Temp%\_MEI28802\conf
- %User Temp%\_MEI28802\certifi
- %User Temp%\_MEI4322
- %User Temp%\_MEI28802
- %User Temp%\images
- %User Temp%\_MEI4322\raw
- %User Temp%\logs
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Autostart Technique
This Trojan Spy adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
system = "%Windows%\system.exe"
Dropping Routine
This Trojan Spy drops the following files:
- %User Temp%\_MEI28802\pyexpat.pyd
- %User Temp%\_MEI28802\win32event.pyd
- %User Temp%\images\1564703251.364545.png
- %User Temp%\images\1564703323.686272.png
- %User Temp%\images\1564703167.623618.png
- %User Temp%\images\1564703188.356034.png
- %User Temp%\_MEI4322\base_library.zip
- %Windows%\system.exe
- %User Temp%\_MEI28802\conf\conf.json
- %User Temp%\_MEI4322\_lzma.pyd
- %User Temp%\_MEI28802\win32api.pyd
- %User Temp%\logs\log.txt
- %User Temp%\_MEI28802\_hashlib.pyd
- %User Temp%\_MEI28802\_lzma.pyd
- %User Temp%\images\1564703219.493689.png
- %User Temp%\_MEI28802\VCRUNTIME140.dll
- %User Temp%\_MEI28802\pywintypes37.dll
- %User Temp%\_MEI4322\raw\logger.jpg
- %User Temp%\_MEI4322\_bz2.pyd
- %User Temp%\_MEI4322\pywintypes37.dll
- %User Temp%\_MEI4322\select.pyd
- %User Temp%\_MEI28802\select.pyd
- %User Temp%\images\1564703282.3774.png
- %User Temp%\_MEI28802\win32gui.pyd
- %User Temp%\_MEI4322\pyexpat.pyd
- %User Temp%\_MEI28802\unicodedata.pyd
- %User Temp%\images\1564703313.374654.png
- %User Temp%\_MEI4322\libcrypto-1_1.dll
- %User Temp%\_MEI28802\libcrypto-1_1.dll
- %User Temp%\images\1564703229.852107.png
- %User Temp%\images\1564703272.003381.png
- %User Temp%\_MEI4322\VCRUNTIME140.dll
- %User Temp%\_MEI28802\base_library.zip
- %User Temp%\images\1564703198.745653.png
- %User Temp%\images\1564703292.704618.png
- %User Temp%\_MEI28802\_socket.pyd
- %User Temp%\images\1564703261.691763.png
- %User Temp%\_MEI28802\libssl-1_1.dll
- %User Temp%\_MEI4322\win32gui.pyd
- %User Temp%\_MEI4322\python37.dll
- %User Temp%\_MEI4322\main.exe.manifest
- %User Temp%\_MEI28802\_queue.pyd
- %User Temp%\images\1564703344.356308.png
- %User Temp%\_MEI28802\python37.dll
- %User Temp%\images\1564703240.257326.png
- %User Temp%\images\1564703177.982016.png
- %User Temp%\zk4ez8ic
- %User Temp%\images\1564703303.047436.png
- %User Temp%\_MEI28802\logger.exe.manifest
- %User Temp%\_MEI4322\libssl-1_1.dll
- %User Temp%\_MEI28802\_ctypes.pyd
- %User Temp%\_MEI4322\unicodedata.pyd
- %User Temp%\_MEI28802\_ssl.pyd
- %User Temp%\images\1564703334.01349.png
- %User Temp%\_MEI28802\certifi\cacert.pem
- %User Temp%\_MEI4322\_hashlib.pyd
- %User Temp%\_MEI4322\_ssl.pyd
- %User Temp%\_MEI4322\_socket.pyd
- %User Temp%\images\1564703209.135271.png
- %User Temp%\_MEI28802\_bz2.pyd
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Other Details
This Trojan Spy connects to the following possibly malicious URL:
- http://{BLOCKED}ig.me
This report is generated via an automated analysis system.
SOLUTION
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Identify and terminate files detected as TrojanSpy.Win32.BOBIK.AA
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- system = "%Windows%\system.exe"
Step 5
Search and delete these components
- %User Temp%\_MEI28802\pyexpat.pyd
- %User Temp%\_MEI28802\win32event.pyd
- %User Temp%\images\1564703251.364545.png
- %User Temp%\images\1564703323.686272.png
- %User Temp%\images\1564703167.623618.png
- %User Temp%\images\1564703188.356034.png
- %User Temp%\_MEI4322\base_library.zip
- %Windows%\system.exe
- %User Temp%\_MEI28802\conf\conf.json
- %User Temp%\_MEI4322\_lzma.pyd
- %User Temp%\_MEI28802\win32api.pyd
- %User Temp%\logs\log.txt
- %User Temp%\_MEI28802\_hashlib.pyd
- %User Temp%\_MEI28802\_lzma.pyd
- %User Temp%\images\1564703219.493689.png
- %User Temp%\_MEI28802\VCRUNTIME140.dll
- %User Temp%\_MEI28802\pywintypes37.dll
- %User Temp%\_MEI4322\raw\logger.jpg
- %User Temp%\_MEI4322\_bz2.pyd
- %User Temp%\_MEI4322\pywintypes37.dll
- %User Temp%\_MEI4322\select.pyd
- %User Temp%\_MEI28802\select.pyd
- %User Temp%\images\1564703282.3774.png
- %User Temp%\_MEI28802\win32gui.pyd
- %User Temp%\_MEI4322\pyexpat.pyd
- %User Temp%\_MEI28802\unicodedata.pyd
- %User Temp%\images\1564703313.374654.png
- %User Temp%\_MEI4322\libcrypto-1_1.dll
- %User Temp%\_MEI28802\libcrypto-1_1.dll
- %User Temp%\images\1564703229.852107.png
- %User Temp%\images\1564703272.003381.png
- %User Temp%\_MEI4322\VCRUNTIME140.dll
- %User Temp%\_MEI28802\base_library.zip
- %User Temp%\images\1564703198.745653.png
- %User Temp%\images\1564703292.704618.png
- %User Temp%\_MEI28802\_socket.pyd
- %User Temp%\images\1564703261.691763.png
- %User Temp%\_MEI28802\libssl-1_1.dll
- %User Temp%\_MEI4322\win32gui.pyd
- %User Temp%\_MEI4322\python37.dll
- %User Temp%\_MEI4322\main.exe.manifest
- %User Temp%\_MEI28802\_queue.pyd
- %User Temp%\images\1564703344.356308.png
- %User Temp%\_MEI28802\python37.dll
- %User Temp%\images\1564703240.257326.png
- %User Temp%\images\1564703177.982016.png
- %User Temp%\zk4ez8ic
- %User Temp%\images\1564703303.047436.png
- %User Temp%\_MEI28802\logger.exe.manifest
- %User Temp%\_MEI4322\libssl-1_1.dll
- %User Temp%\_MEI28802\_ctypes.pyd
- %User Temp%\_MEI4322\unicodedata.pyd
- %User Temp%\_MEI28802\_ssl.pyd
- %User Temp%\images\1564703334.01349.png
- %User Temp%\_MEI28802\certifi\cacert.pem
- %User Temp%\_MEI4322\_hashlib.pyd
- %User Temp%\_MEI4322\_ssl.pyd
- %User Temp%\_MEI4322\_socket.pyd
- %User Temp%\images\1564703209.135271.png
- %User Temp%\_MEI28802\_bz2.pyd
Step 6
Search and delete these folders
- %User Temp%\_MEI28802\conf
- %User Temp%\_MEI28802\certifi
- %User Temp%\_MEI4322
- %User Temp%\_MEI28802
- %User Temp%\images
- %User Temp%\_MEI4322\raw
- %User Temp%\logs
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win32.BOBIK.AA. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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