General
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Target
SteamAPI Unhooker.bat
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Size
1002KB
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Sample
240528-q6t8bsga6y
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MD5
f6d5bfaee8a55ff72c7b453fda066d62
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SHA1
7d737d53013990e5d05076b7206e43eb4793fc7f
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SHA256
3ff8b6a041a96625d730dfe770eb6e84be8ce99fc50a0027724e48394f053308
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SHA512
e300c15bef9e898e7abd4ecf6759c0e60829e8d9b507e257359b0c0342c56d56adf7924c76ffbbee4c42e1b1ea229b7032d177849d2668720090780190b7f284
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SSDEEP
12288:NzPPeJOTZMGuIl99I2FxGwvYXDSeengmfn5tKvy0H5JbcGfRZIJZ32hxnQxCGaF9:NDeYum99IGP8f2rRO5JFPIJZ8GaF8XmB
Static task
static1
Behavioral task
behavioral1
Sample
SteamAPI Unhooker.bat
Resource
win10-20240404-en
Behavioral task
behavioral2
Sample
SteamAPI Unhooker.bat
Resource
win10v2004-20240426-en
Malware Config
Extracted
quasar
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reconnect_delay
3000
Extracted
quasar
3.1.5
Video
runderscore00-25501.portmap.host:25501
$Sxr-oWTh3ZS9htfe80iIl5
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encryption_key
zK8u0rpHf4TJzGf65Flt
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install_name
Win11.exe
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log_directory
$sxr-Logs
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reconnect_delay
3000
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startup_key
Windows 11 Boot
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subdirectory
Win11
Targets
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Target
SteamAPI Unhooker.bat
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Size
1002KB
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MD5
f6d5bfaee8a55ff72c7b453fda066d62
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SHA1
7d737d53013990e5d05076b7206e43eb4793fc7f
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SHA256
3ff8b6a041a96625d730dfe770eb6e84be8ce99fc50a0027724e48394f053308
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SHA512
e300c15bef9e898e7abd4ecf6759c0e60829e8d9b507e257359b0c0342c56d56adf7924c76ffbbee4c42e1b1ea229b7032d177849d2668720090780190b7f284
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SSDEEP
12288:NzPPeJOTZMGuIl99I2FxGwvYXDSeengmfn5tKvy0H5JbcGfRZIJZ32hxnQxCGaF9:NDeYum99IGP8f2rRO5JFPIJZ8GaF8XmB
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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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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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Drops file in System32 directory
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Suspicious use of SetThreadContext
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