Analysis
- max time kernel
38s - max time network
35s - platform
windows11-21h2_x64 - resource
win11-20260513-en - resource tags
- submitted
05/06/2026, 04:29
General
- Target 4deebf56cf37840df28dcc8fbaaff10223300a0834f56.exe
- Size 3.1MB
- Sample260605-e4bgnaaz6s
- SHA256 4deebf56cf37840df28dcc8fbaaff10223300a0834f564aff2b89d3875abd900
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
branleet.duckdns.org:1337
-
4c3a0dea-152b-4ecb-bf8d-3586fefe50c8
-
encryption_key
28C3106CD1CEC9A5DFEC7F2BA3B0DD7E70784429
-
install_name
fontdrvhost.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
fontdrvhost
-
subdirectory
SecurityHealth
Signatures
- Family: Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 2 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 3 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 3 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\4deebf56cf37840df28dcc8fbaaff10223300a0834f56.exe"C:\Users\Admin\AppData\Local\Temp\4deebf56cf37840df28dcc8fbaaff10223300a0834f56.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SecurityHealth\fontdrvhost.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Users\Admin\AppData\Roaming\SecurityHealth\fontdrvhost.exe"C:\Users\Admin\AppData\Roaming\SecurityHealth\fontdrvhost.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SecurityHealth\fontdrvhost.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
-
C:\Users\Admin\AppData\Roaming\SecurityHealth\fontdrvhost.exeC:\Users\Admin\AppData\Roaming\SecurityHealth\fontdrvhost.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
fontdrvhost.exe
memory/4268-0-0x00000000001E0000-0x0000000000504000-memory.dmp
memory/4268-1-0x000000001C840000-0x000000001C850000-memory.dmp
memory/4652-8-0x000000001D5A0000-0x000000001D5B0000-memory.dmp
memory/4652-11-0x000000001DCF0000-0x000000001DD40000-memory.dmp
memory/4652-12-0x000000001DE00000-0x000000001DEB2000-memory.dmp
memory/4652-13-0x000000001D5A0000-0x000000001D5B0000-memory.dmp