General
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Target
b42e7395d548094719753ce21cafc064
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Size
500KB
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Sample
240305-jpkt1aah27
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MD5
b42e7395d548094719753ce21cafc064
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SHA1
6baed6fc826f81aa77cbd71945c46d44c04718e4
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SHA256
95f5e8a8f81cc22aa687cf82e0d6cadbf130f25018fa0097710927ed40d2f939
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SHA512
52d741889f330dddfa97897c3b642fbd7a05364b1122e794a4deab0d4c2214f6629b2e03727f5422161fff4d83e82b93866339623917b88e8123fc271a6a4557
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SSDEEP
12288:G3s06nf8okk8kGfCIcgiLTXWswMGMv0MSPmIQWe:BPfkkZ8diLjXzGySPm7We
Static task
static1
Behavioral task
behavioral1
Sample
b42e7395d548094719753ce21cafc064.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
b42e7395d548094719753ce21cafc064.exe
Resource
win10v2004-20240226-en
Malware Config
Targets
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Target
b42e7395d548094719753ce21cafc064
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Size
500KB
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MD5
b42e7395d548094719753ce21cafc064
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SHA1
6baed6fc826f81aa77cbd71945c46d44c04718e4
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SHA256
95f5e8a8f81cc22aa687cf82e0d6cadbf130f25018fa0097710927ed40d2f939
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SHA512
52d741889f330dddfa97897c3b642fbd7a05364b1122e794a4deab0d4c2214f6629b2e03727f5422161fff4d83e82b93866339623917b88e8123fc271a6a4557
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SSDEEP
12288:G3s06nf8okk8kGfCIcgiLTXWswMGMv0MSPmIQWe:BPfkkZ8diLjXzGySPm7We
Score10/10-
ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
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ISR Stealer payload
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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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Loads dropped DLL
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Adds Run key to start application
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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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Suspicious use of SetThreadContext
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