Analysis
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max time kernel
142s -
max time network
147s -
platform
windows10-2004_x64 -
resource
win10v2004-20231127-en -
resource tags
arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system -
submitted
28-11-2023 13:09
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20231023-en
General
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Target
Client-built.exe
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Size
349KB
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MD5
2207ba09525cf5c4b7b7e09359bd6118
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SHA1
2c266c94899b4cb038e812ed1c067b47979399bd
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SHA256
fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
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SHA512
628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb
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SSDEEP
6144:FKMJx4pweP7kJS3iCxPMQ0PTCo6t6RXzxNTpGbGttZoap9O:FKoS5xM3PTCoa6Jz9btkm9O
Malware Config
Extracted
quasar
1.3.0.0
Office04
223.27.104.5:4782
QSR_MUTEX_TKIGmUQNaov60j8Osd
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encryption_key
fNvCkOKAiWAMHbrA0e7Y
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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
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 3 IoCs
resource yara_rule behavioral2/memory/4396-0-0x00000000005F0000-0x000000000064E000-memory.dmp family_quasar behavioral2/files/0x000a00000002321d-10.dat family_quasar behavioral2/files/0x000a00000002321d-11.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 1788 Client.exe -
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 24 ip-api.com -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 4280 schtasks.exe 1292 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4396 Client-built.exe Token: SeDebugPrivilege 1788 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 1788 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
description pid Process procid_target PID 4396 wrote to memory of 4280 4396 Client-built.exe 92 PID 4396 wrote to memory of 4280 4396 Client-built.exe 92 PID 4396 wrote to memory of 4280 4396 Client-built.exe 92 PID 4396 wrote to memory of 1788 4396 Client-built.exe 94 PID 4396 wrote to memory of 1788 4396 Client-built.exe 94 PID 4396 wrote to memory of 1788 4396 Client-built.exe 94 PID 1788 wrote to memory of 1292 1788 Client.exe 95 PID 1788 wrote to memory of 1292 1788 Client.exe 95 PID 1788 wrote to memory of 1292 1788 Client.exe 95
Processes
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C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4396 -
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:4280
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1788 -
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:1292
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
349KB
MD52207ba09525cf5c4b7b7e09359bd6118
SHA12c266c94899b4cb038e812ed1c067b47979399bd
SHA256fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb
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Filesize
349KB
MD52207ba09525cf5c4b7b7e09359bd6118
SHA12c266c94899b4cb038e812ed1c067b47979399bd
SHA256fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb