BKDR_PROXY.APV
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
94,208 bytes
EXE
No
19 Jan 2015
Arrival Details
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- list, find, read and get file information
- list and get drive information
- delete files
- start or terminate a process
- download and execute arbitrary files
- perform remote shell commands
- sleep
- copy %System%\cmd.exe as {folder specified by remote attacker}\slsa.exe
- copy %System%\ja-JP\cmd.exe.mui as {folder specified by remote attacker}\cmd.exe.mui
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- www.{BLOCKED}asket.net
As of this writing, the said sites are inaccessible.
Information Theft
This backdoor accepts the following parameters:
- base64 encoded string containing the username and password of the proxy server of the infected machine separated by a colon
It gathers the following data:
- operating system
- host name
- user name
- IP address
- MAC address
NOTES:
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.700
11.425.00
21 Jan 2015
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
Identify and terminate files detected as BKDR_PROXY.APV
- 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 3
Search and delete these files
- slsa.exe
- cmd.exe.mui
Step 4
Scan your computer with your Trend Micro product to delete files detected as BKDR_PROXY.APV. 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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