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Analysis
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max time kernel
140s -
max time network
148s -
platform
windows7_x64 -
resource
win7-20240508-en -
resource tags
arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system -
submitted
04/06/2024, 01:52
Static task
static1
Behavioral task
behavioral1
Sample
b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll
Resource
win7-20240508-en
Behavioral task
behavioral2
Sample
b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll
Resource
win10v2004-20240508-en
General
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Target
b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll
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Size
89KB
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MD5
c944bb0548937bcaeb27b59efd866912
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SHA1
59fb5f7d37690f950edf70ce7dd8abb1d634d3d3
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SHA256
b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6
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SHA512
2b644352fd9209f0f4f1976b2ec57cb058c98667dc385c2d0edb630d3a210df6122f207b735bc136ebc5b822ca5308a9c5c7019daf0e9381f6bf3d9f373c2a4e
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SSDEEP
1536:XHXqO6ZG03eyenOj9lgA/PObuTMT5NMCfL7ojaZf5aZlBlG7:M1uF6Feu2NlQOBcG7
Malware Config
Signatures
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Detects executables containing base64 encoded User Agent 3 IoCs
resource yara_rule behavioral1/memory/1524-2-0x0000000010000000-0x0000000010033000-memory.dmp INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent behavioral1/memory/1524-6-0x0000000010000000-0x0000000010033000-memory.dmp INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent behavioral1/memory/1524-7-0x0000000010000000-0x0000000010033000-memory.dmp INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral1/memory/1524-1-0x0000000010000000-0x0000000010033000-memory.dmp UPX behavioral1/memory/1524-2-0x0000000010000000-0x0000000010033000-memory.dmp UPX behavioral1/memory/1524-6-0x0000000010000000-0x0000000010033000-memory.dmp UPX behavioral1/memory/1524-7-0x0000000010000000-0x0000000010033000-memory.dmp UPX -
Blocklisted process makes network request 10 IoCs
flow pid Process 3 1524 rundll32.exe 7 1524 rundll32.exe 8 1524 rundll32.exe 9 1524 rundll32.exe 10 1524 rundll32.exe 13 1524 rundll32.exe 14 1524 rundll32.exe 15 1524 rundll32.exe 17 1524 rundll32.exe 18 1524 rundll32.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2737914667-933161113-3798636211-1000\Software\Microsoft\Windows\CurrentVersion\Run\VIEW = "C:\\Windows\\SysWOW64\\rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll\",Viewer" rundll32.exe -
Enumerates connected drives 3 TTPs 23 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
description ioc Process File opened (read-only) \??\s: rundll32.exe File opened (read-only) \??\j: rundll32.exe File opened (read-only) \??\l: rundll32.exe File opened (read-only) \??\q: rundll32.exe File opened (read-only) \??\u: rundll32.exe File opened (read-only) \??\w: rundll32.exe File opened (read-only) \??\y: rundll32.exe File opened (read-only) \??\g: rundll32.exe File opened (read-only) \??\h: rundll32.exe File opened (read-only) \??\i: rundll32.exe File opened (read-only) \??\k: rundll32.exe File opened (read-only) \??\m: rundll32.exe File opened (read-only) \??\n: rundll32.exe File opened (read-only) \??\o: rundll32.exe File opened (read-only) \??\t: rundll32.exe File opened (read-only) \??\a: rundll32.exe File opened (read-only) \??\x: rundll32.exe File opened (read-only) \??\v: rundll32.exe File opened (read-only) \??\e: rundll32.exe File opened (read-only) \??\p: rundll32.exe File opened (read-only) \??\r: rundll32.exe File opened (read-only) \??\z: rundll32.exe File opened (read-only) \??\b: rundll32.exe -
Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
description ioc Process File opened for modification \??\PHYSICALDRIVE0 rundll32.exe -
Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 rundll32.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString rundll32.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 1524 rundll32.exe 1524 rundll32.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 1524 rundll32.exe -
Suspicious use of WriteProcessMemory 7 IoCs
description pid Process procid_target PID 2116 wrote to memory of 1524 2116 rundll32.exe 28 PID 2116 wrote to memory of 1524 2116 rundll32.exe 28 PID 2116 wrote to memory of 1524 2116 rundll32.exe 28 PID 2116 wrote to memory of 1524 2116 rundll32.exe 28 PID 2116 wrote to memory of 1524 2116 rundll32.exe 28 PID 2116 wrote to memory of 1524 2116 rundll32.exe 28 PID 2116 wrote to memory of 1524 2116 rundll32.exe 28
Processes
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C:\Windows\system32\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll,#11⤵
- Suspicious use of WriteProcessMemory
PID:2116 -
C:\Windows\SysWOW64\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll,#12⤵
- Blocklisted process makes network request
- Adds Run key to start application
- Enumerates connected drives
- Writes to the Master Boot Record (MBR)
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1524
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Network
MITRE ATT&CK Enterprise v15
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