WORM_QAKBOT.BV
W32.Qakbot (Symantec); W32/Pinkslipbot (Mcafee); Bck/Qbot.AO (Panda)
Windows 2000, XP, Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This worm 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
272,544 bytes
EXE
Yes
19 May 2011
Arrival Details
This worm 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 worm drops the following files:
- %System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}\{random characters}.dll - detected as TROJ_QAKBOT.BT
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It drops the following copies of itself into the affected system:
- %System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}\{random characters}.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It creates the following folders:
- %System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random characters} = %System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}\{random characters}.exe
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{legitimate application} = "%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}\{random characters}.exe" /c {path and file name of legitimate application}
(Note: The default value data of the said registry entry is {path and file name of legitimate application}.)