Analysis
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max time kernel
27s -
max time network
34s -
platform
windows10-1703_x64 -
resource
win10-20220812-en -
resource tags
arch:x64arch:x86image:win10-20220812-enlocale:en-usos:windows10-1703-x64system -
submitted
19/01/2023, 20:22
Static task
static1
General
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Target
l1yprr.ps1
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Size
5.1MB
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MD5
861b5567c79e55d2a3c704a9bbece9dc
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SHA1
8ba826c4760bc5e39b41bb0bfead46c4792a3607
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SHA256
6f890fdcdb5267b92b3b793ff8b17484bc1a6a4107a68f2b4282d386225b63f1
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SHA512
dd153c269f4b2505449dcc52219f419514dd9aeb312eae4b04140ac0e7662675286044874fb665e900b433c95728c476dc3ee03a919671bea3f8f6635b0a8400
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SSDEEP
49152:fY1wOeTfeinwRg0Yd0YtWdR2++BqkPiblNmBZOqsHtL3rdyW6JKHINYMpnkq/3+/:y
Malware Config
Extracted
Family
quasar
Version
1.4.0
Botnet
Office04
C2
ghcc.duckdns.org:4782
Mutex
a9c03eb7-f3c1-4b9e-a4f7-1962d17a793b
Attributes
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encryption_key
B0326395AC2D48856CAE22978A087DF5DCF5816D
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Update
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
resource yara_rule behavioral1/memory/4896-138-0x0000000000400000-0x0000000000484000-memory.dmp family_quasar behavioral1/memory/4896-139-0x000000000047E77E-mapping.dmp family_quasar -
Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 8 api.ipify.org 9 api.ipify.org -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 2500 set thread context of 4896 2500 powershell.exe 67 -
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 4932 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 3 IoCs
pid Process 2500 powershell.exe 2500 powershell.exe 2500 powershell.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2500 powershell.exe Token: SeDebugPrivilege 4896 RegAsm.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 4896 RegAsm.exe -
Suspicious use of WriteProcessMemory 11 IoCs
description pid Process procid_target PID 2500 wrote to memory of 4896 2500 powershell.exe 67 PID 2500 wrote to memory of 4896 2500 powershell.exe 67 PID 2500 wrote to memory of 4896 2500 powershell.exe 67 PID 2500 wrote to memory of 4896 2500 powershell.exe 67 PID 2500 wrote to memory of 4896 2500 powershell.exe 67 PID 2500 wrote to memory of 4896 2500 powershell.exe 67 PID 2500 wrote to memory of 4896 2500 powershell.exe 67 PID 2500 wrote to memory of 4896 2500 powershell.exe 67 PID 4896 wrote to memory of 4932 4896 RegAsm.exe 68 PID 4896 wrote to memory of 4932 4896 RegAsm.exe 68 PID 4896 wrote to memory of 4932 4896 RegAsm.exe 68
Processes
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\l1yprr.ps11⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2500 -
C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"2⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4896 -
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Update" /sc ONLOGON /tr "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:4932
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