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Analysis
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max time kernel
160s -
max time network
175s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
07/03/2024, 22:42
Static task
static1
Behavioral task
behavioral1
Sample
Client-built-stub-fub.exe
Resource
win7-20240221-en
General
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Target
Client-built-stub-fub.exe
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Size
3.2MB
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MD5
9f12e3815f269826203a1baae1761698
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SHA1
a6f1047279952df4f0c4b0f15fbef84d2a8ef2f5
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SHA256
fbe5f5d43d9c6631ff75557f9eec341c15b58cac301de3b573bc1913a4daa3e0
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SHA512
1c086a83fa969bacadef854eaddc6ad72f51abb1536a27af5c89604df3cc9641765cbd4d5bb6144956b07d0a8fd8fd3318665e6185b69d80235fdbc92d0f960d
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SSDEEP
49152:St+NHEEtT54YyDAP4m2w99yvHT+8sVEDjP+IMh2d8KdZOQra3txClJHgo4jL4/jL:cbEt9HnEo9U+KjPe0d/dcTHmtx4j6jL
Malware Config
Extracted
quasar
1.4.1
Default
dksj.wi-fi.rip:4782
f62fc232-4c6c-47fc-9704-2111bc364f22
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encryption_key
E883FEA800A47B3B853A04DDCD0D162E782B41B7
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install_name
Client.exe
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log_directory
fdgdg
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reconnect_delay
3000
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startup_key
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 1 IoCs
resource yara_rule behavioral2/memory/5116-4-0x0000000000400000-0x0000000000724000-memory.dmp family_quasar -
Uses the VBS compiler for execution 1 TTPs
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Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 5112 set thread context of 5116 5112 Client-built-stub-fub.exe 91 -
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 4788 schtasks.exe -
Suspicious behavior: RenamesItself 1 IoCs
pid Process 5112 Client-built-stub-fub.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 5116 vbc.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 5116 vbc.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 5112 wrote to memory of 5116 5112 Client-built-stub-fub.exe 91 PID 5112 wrote to memory of 5116 5112 Client-built-stub-fub.exe 91 PID 5112 wrote to memory of 5116 5112 Client-built-stub-fub.exe 91 PID 5112 wrote to memory of 5116 5112 Client-built-stub-fub.exe 91 PID 5112 wrote to memory of 5116 5112 Client-built-stub-fub.exe 91 PID 5112 wrote to memory of 5116 5112 Client-built-stub-fub.exe 91 PID 5112 wrote to memory of 5116 5112 Client-built-stub-fub.exe 91 PID 5112 wrote to memory of 5116 5112 Client-built-stub-fub.exe 91 PID 5112 wrote to memory of 2320 5112 Client-built-stub-fub.exe 92 PID 5112 wrote to memory of 2320 5112 Client-built-stub-fub.exe 92 PID 5112 wrote to memory of 2320 5112 Client-built-stub-fub.exe 92 PID 5112 wrote to memory of 3696 5112 Client-built-stub-fub.exe 93 PID 5112 wrote to memory of 3696 5112 Client-built-stub-fub.exe 93 PID 5112 wrote to memory of 3696 5112 Client-built-stub-fub.exe 93 PID 5112 wrote to memory of 2180 5112 Client-built-stub-fub.exe 94 PID 5112 wrote to memory of 2180 5112 Client-built-stub-fub.exe 94 PID 5112 wrote to memory of 2180 5112 Client-built-stub-fub.exe 94 PID 3696 wrote to memory of 4788 3696 cmd.exe 98 PID 3696 wrote to memory of 4788 3696 cmd.exe 98 PID 3696 wrote to memory of 4788 3696 cmd.exe 98
Processes
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C:\Users\Admin\AppData\Local\Temp\Client-built-stub-fub.exe"C:\Users\Admin\AppData\Local\Temp\Client-built-stub-fub.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: RenamesItself
- Suspicious use of WriteProcessMemory
PID:5112 -
C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"2⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:5116
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C:\Windows\SysWOW64\cmd.exe"cmd" /c mkdir "C:\Users\Admin\AppData\Roaming\ereregd"2⤵PID:2320
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C:\Windows\SysWOW64\cmd.exe"cmd" /c schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\ereregd\ereregd.exe'" /f2⤵
- Suspicious use of WriteProcessMemory
PID:3696 -
C:\Windows\SysWOW64\schtasks.exeschtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\ereregd\ereregd.exe'" /f3⤵
- Creates scheduled task(s)
PID:4788
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C:\Windows\SysWOW64\cmd.exe"cmd" /c copy "C:\Users\Admin\AppData\Local\Temp\Client-built-stub-fub.exe" "C:\Users\Admin\AppData\Roaming\ereregd\ereregd.exe"2⤵PID:2180
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