General
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Target
Uni.bat
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Size
554KB
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Sample
240611-v9pjgavfjb
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MD5
d4c582bb5890af020c110f2b1de1d9db
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SHA1
04c25b115c7bdaced94746c4acf9b5245f064ea0
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SHA256
d34225f65c10acac82f381cf0f4281b2bc691afb2b72a1331acee94ca10e5c1c
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SHA512
4b104fd0f62ecab38cc02b4cd77e6b8b5bcaaa3d98ad48f537fc7a67aa7d72d4575026921b63c9a743a41faaf3dd3154717bd6690f87dcb4114da05106b93012
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SSDEEP
12288:ej66ws6Lf5zkTfhiOQbanOdEcl8uhySTl5fzu+oRjfTs1117e:e2xHf5WhsbWMzllySxQ4bc
Static task
static1
Behavioral task
behavioral1
Sample
Uni.bat
Resource
win10-20240404-en
Behavioral task
behavioral2
Sample
Uni.bat
Resource
win10v2004-20240508-en
Malware Config
Extracted
quasar
3.0.0
Slave
runderscore00-63294.portmap.host:63294
QSR_MUTEX_KJSikjqkjc5AYGioTK
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encryption_key
pN2MVZndQf3jaY1iGlHN
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install_name
$sxr-powershell.exe
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log_directory
$sxr-Logs
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reconnect_delay
3000
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startup_key
Powershell
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subdirectory
$sxr-seroxen2
Targets
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Target
Uni.bat
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Size
554KB
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MD5
d4c582bb5890af020c110f2b1de1d9db
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SHA1
04c25b115c7bdaced94746c4acf9b5245f064ea0
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SHA256
d34225f65c10acac82f381cf0f4281b2bc691afb2b72a1331acee94ca10e5c1c
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SHA512
4b104fd0f62ecab38cc02b4cd77e6b8b5bcaaa3d98ad48f537fc7a67aa7d72d4575026921b63c9a743a41faaf3dd3154717bd6690f87dcb4114da05106b93012
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SSDEEP
12288:ej66ws6Lf5zkTfhiOQbanOdEcl8uhySTl5fzu+oRjfTs1117e:e2xHf5WhsbWMzllySxQ4bc
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Quasar payload
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Suspicious use of NtCreateUserProcessOtherParentProcess
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Blocklisted process makes network request
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Sets service image path in registry
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Checks BIOS information in registry
BIOS information is often read in order to detect sandboxing environments.
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE
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Enumerates connected drives
Attempts to read the root path of hard drives other than the default C: drive.
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Looks up external IP address via web service
Uses a legitimate IP lookup service to find the infected system's external IP.
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Writes to the Master Boot Record (MBR)
Bootkits write to the MBR to gain persistence at a level below the operating system.
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Drops file in System32 directory
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Suspicious use of SetThreadContext
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MITRE ATT&CK Matrix ATT&CK v13
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Pre-OS Boot
1Bootkit
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1