Ransom_STAMPADO.F117E8
VirTool:INF/Autorun!rfn (Microsoft); Trojan.Gen.2 (Symantec); Trojan-Ransom.Win32.Blocker.jzyl (Kaspersky); Troj/Stampado-A (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Generic17_c.BNRI (AVG)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Update Notifier = "%User Profile%\Application Data\Isass.exe "
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Update Notifier = "%User Profile%\Application Data\Isass.exe "
Dropping Routine
This Trojan drops the following files:
- %User Temp%\aut1.tmp
- %User Temp%\ciekqvm
- %User Temp%\aut5.tmp
- %User Temp%\delphi.au3.509
- %User Temp%\aut9.tmp
- %User Temp%\autD.tmp
- %User Temp%\pd4ta.dat
- %User Temp%\delph1.dat
- %User Temp%\aut13.tmp
- %User Temp%\tgumqkp
- %User Profile%\Application Data\Isass.exe
- %User Profile%\Application Data\Isass.exe:Zone.Identifier
- %User Temp%\aut1F.tmp
- %User Temp%\ymqykkm
- %User Temp%\aut23.tmp
- %User Temp%\nfpolyk
- %User Startup%\Update Notifier.lnk
- %Common Startup%\Update Notifier.lnk
- %User Temp%\aut2F.tmp
- %User Temp%\vwvsgpn
- %User Temp%\aut39.tmp
- %User Temp%\uiigdly
- %User Temp%\aut43.tmp
- %User Temp%\gyillaj
- %User Temp%\aut4D.tmp
- %User Temp%\bgtplcw
- %User Temp%\aut57.tmp
- %User Temp%\hlndjem
- %User Temp%\aut61.tmp
- %User Temp%\ejlkvsj
- %User Temp%\delph1.bin
- %User Temp%\pd4ta.bin
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003, and C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}er.net/damn.exe
- {BLOCKED}.116.84
- {BLOCKED}.194.174
- {BLOCKED}.194.164
This report is generated via an automated analysis system.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
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
- Update Notifier = "%User Profile%\Application Data\Isass.exe "
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Update Notifier = "%User Profile%\Application Data\Isass.exe "
Step 4
Search and delete these components
- %User Temp%\aut1.tmp
- %User Temp%\ciekqvm
- %User Temp%\aut5.tmp
- %User Temp%\delphi.au3.509
- %User Temp%\aut9.tmp
- %User Temp%\autD.tmp
- %User Temp%\pd4ta.dat
- %User Temp%\delph1.dat
- %User Temp%\aut13.tmp
- %User Temp%\tgumqkp
- %User Profile%\Application Data\Isass.exe
- %User Profile%\Application Data\Isass.exe:Zone.Identifier
- %User Temp%\aut1F.tmp
- %User Temp%\ymqykkm
- %User Temp%\aut23.tmp
- %User Temp%\nfpolyk
- %User Startup%\Update Notifier.lnk
- %Common Startup%\Update Notifier.lnk
- %User Temp%\aut2F.tmp
- %User Temp%\vwvsgpn
- %User Temp%\aut39.tmp
- %User Temp%\uiigdly
- %User Temp%\aut43.tmp
- %User Temp%\gyillaj
- %User Temp%\aut4D.tmp
- %User Temp%\bgtplcw
- %User Temp%\aut57.tmp
- %User Temp%\hlndjem
- %User Temp%\aut61.tmp
- %User Temp%\ejlkvsj
- %User Temp%\delph1.bin
- %User Temp%\pd4ta.bin
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom_STAMPADO.F117E8. 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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