Analysis
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max time kernel
120s -
max time network
138s -
platform
windows7_x64 -
resource
win7-20231025-en -
resource tags
arch:x64arch:x86image:win7-20231025-enlocale:en-usos:windows7-x64system -
submitted
28-11-2023 13:09
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20231025-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 6 IoCs
resource yara_rule behavioral1/memory/1804-0-0x0000000000DC0000-0x0000000000E1E000-memory.dmp family_quasar behavioral1/files/0x00080000000120ed-4.dat family_quasar behavioral1/files/0x00080000000120ed-7.dat family_quasar behavioral1/files/0x00080000000120ed-8.dat family_quasar behavioral1/memory/2632-9-0x0000000000090000-0x00000000000EE000-memory.dmp family_quasar behavioral1/memory/2632-11-0x0000000004AE0000-0x0000000004B20000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2632 Client.exe -
Loads dropped DLL 1 IoCs
pid Process 1804 Client-built.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 2 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 2120 schtasks.exe 2708 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1804 Client-built.exe Token: SeDebugPrivilege 2632 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2632 Client.exe -
Suspicious use of WriteProcessMemory 12 IoCs
description pid Process procid_target PID 1804 wrote to memory of 2120 1804 Client-built.exe 29 PID 1804 wrote to memory of 2120 1804 Client-built.exe 29 PID 1804 wrote to memory of 2120 1804 Client-built.exe 29 PID 1804 wrote to memory of 2120 1804 Client-built.exe 29 PID 1804 wrote to memory of 2632 1804 Client-built.exe 31 PID 1804 wrote to memory of 2632 1804 Client-built.exe 31 PID 1804 wrote to memory of 2632 1804 Client-built.exe 31 PID 1804 wrote to memory of 2632 1804 Client-built.exe 31 PID 2632 wrote to memory of 2708 2632 Client.exe 32 PID 2632 wrote to memory of 2708 2632 Client.exe 32 PID 2632 wrote to memory of 2708 2632 Client.exe 32 PID 2632 wrote to memory of 2708 2632 Client.exe 32
Processes
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C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1804 -
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:2120
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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:2632 -
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:2708
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
349KB
MD52207ba09525cf5c4b7b7e09359bd6118
SHA12c266c94899b4cb038e812ed1c067b47979399bd
SHA256fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb
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Filesize
349KB
MD52207ba09525cf5c4b7b7e09359bd6118
SHA12c266c94899b4cb038e812ed1c067b47979399bd
SHA256fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb
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Filesize
349KB
MD52207ba09525cf5c4b7b7e09359bd6118
SHA12c266c94899b4cb038e812ed1c067b47979399bd
SHA256fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb