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Analysis
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max time kernel
118s -
max time network
119s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
15/03/2025, 23:37
Static task
static1
Behavioral task
behavioral1
Sample
39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe
Resource
win10v2004-20250313-en
General
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Target
39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe
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Size
164KB
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MD5
761bcf1d315a442b1281f5d0f8ce4fa6
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SHA1
e4a9586d926514f198ee1ee4cd8725721ffa234f
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SHA256
39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c
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SHA512
1310ef76ae4b638c4cc6574cb3d7e24f69dc7b59581b4c3f60814072e9446d61d55b69ba69c22509c9d587d5328a1fff28469a4beb6a93625befddbe6213f313
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SSDEEP
3072:TY3W224yAIM6H/vOXoE1EMuXnD7KHmL4OnA:0G4yzRUoE1QXyO
Malware Config
Signatures
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ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
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ISR Stealer payload 5 IoCs
resource yara_rule behavioral1/memory/2476-6-0x0000000000400000-0x000000000040B000-memory.dmp family_isrstealer behavioral1/memory/2476-10-0x0000000000400000-0x000000000040B000-memory.dmp family_isrstealer behavioral1/memory/2476-12-0x0000000000400000-0x000000000040B000-memory.dmp family_isrstealer behavioral1/memory/2476-15-0x0000000000400000-0x000000000040B000-memory.dmp family_isrstealer behavioral1/memory/2476-16-0x0000000000400000-0x000000000040B000-memory.dmp family_isrstealer -
Isrstealer family
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Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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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 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 2304 set thread context of 2476 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 30 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Program crash 1 IoCs
pid pid_target Process procid_target 1856 2476 WerFault.exe 30 -
System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 2476 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe -
Suspicious use of WriteProcessMemory 12 IoCs
description pid Process procid_target PID 2304 wrote to memory of 2476 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 30 PID 2304 wrote to memory of 2476 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 30 PID 2304 wrote to memory of 2476 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 30 PID 2304 wrote to memory of 2476 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 30 PID 2304 wrote to memory of 2476 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 30 PID 2304 wrote to memory of 2476 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 30 PID 2304 wrote to memory of 2476 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 30 PID 2304 wrote to memory of 2476 2304 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 30 PID 2476 wrote to memory of 1856 2476 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 31 PID 2476 wrote to memory of 1856 2476 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 31 PID 2476 wrote to memory of 1856 2476 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 31 PID 2476 wrote to memory of 1856 2476 39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe 31
Processes
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C:\Users\Admin\AppData\Local\Temp\39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe"C:\Users\Admin\AppData\Local\Temp\39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe"1⤵
- Writes to the Master Boot Record (MBR)
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2304 -
C:\Users\Admin\AppData\Local\Temp\39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe"C:\Users\Admin\AppData\Local\Temp\39cef98c230cfed0768fa061c1c42bd32080b7c1725cb43f9068b711749e8f3c.exe"2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2476 -
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 2476 -s 5123⤵
- Program crash
PID:1856
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