Analysis
- max time kernel
44s - max time network
45s - platform
windows10-2004_x64 - resource
win10v2004-20241007-en - resource tags
- submitted
06/11/2024, 14:36
General
- Target Client-built.exe
- Size 3.1MB
- Sample241106-ry24mstrdl
- SHA256 b6a9d5b847a9b36874a2b95dab1b7e3fbe0a9fa0ac0577598b0810bd31798bfb
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
heyhey5577-38424.portmap.host:38424
-
81fe4881-d995-475f-a69c-87b3e84568e5
-
encryption_key
36434604456E6FAC74D069938FAF746337F3F873
-
install_name
winupdate.exe
-
log_directory
UpdaterInfo
-
reconnect_delay
3000
-
startup_key
winsysupdater
-
subdirectory
WlNDOWS
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar family
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 5 IoCs
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "winsysupdater" /sc ONLOGON /tr "C:\Windows\system32\WlNDOWS\winupdate.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Windows\system32\WlNDOWS\winupdate.exe"C:\Windows\system32\WlNDOWS\winupdate.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "winsysupdater" /sc ONLOGON /tr "C:\Windows\system32\WlNDOWS\winupdate.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
winupdate.exe
memory/440-10-0x00007FFCED2A0000-0x00007FFCEDD61000-memory.dmp
memory/440-11-0x00007FFCED2A0000-0x00007FFCEDD61000-memory.dmp
memory/440-12-0x0000000003390000-0x00000000033E0000-memory.dmp
memory/440-13-0x000000001C5C0000-0x000000001C672000-memory.dmp
memory/440-14-0x00007FFCED2A0000-0x00007FFCEDD61000-memory.dmp
memory/4000-0-0x00007FFCED2A3000-0x00007FFCED2A5000-memory.dmp
memory/4000-1-0x00000000005A0000-0x00000000008C4000-memory.dmp
memory/4000-2-0x00007FFCED2A0000-0x00007FFCEDD61000-memory.dmp
memory/4000-9-0x00007FFCED2A0000-0x00007FFCEDD61000-memory.dmp