Analysis
-
max time kernel
135s -
max time network
162s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
19-04-2024 11:09
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240221-en
General
-
Target
Client-built.exe
-
Size
3.1MB
-
MD5
2c1fba8d6624adf6c582fb2d5fb43b28
-
SHA1
bd45ee984e9476d604824f83c6cf6111a9db2467
-
SHA256
a5473ea4c4ef75c217e0d252d1c7d235b781a75810b7e731a97ed78b45646840
-
SHA512
cc85b5f1c2765c49f34c236634dcbfdfd6cc62e0b954b74c12b0d89dc29044dff88a9840e5c02a39e140564283074c78359dd70dfc7f426daefb75f195f14e19
-
SSDEEP
49152:nvVG42pda6D+/PjlLOlg6yQipV6iRJ67bR3LoGdTqTHHB72eh2NT:nvM42pda6D+/PjlLOlZyQipV6iRJ6ND
Malware Config
Extracted
quasar
1.4.1
Office04
funlink.ddns.net:4444
quasarhost1.ddns.net:4444
c363b2f8-fc6a-4abd-a753-cff1aad2a173
-
encryption_key
CE5FBAC1A56C8C780C74FE8E7CD5CBCF8ABD6C8D
-
install_name
updale.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
windows av startup
-
subdirectory
SubDir
Signatures
-
Quasar payload 1 IoCs
Processes:
resource yara_rule behavioral2/memory/1504-0-0x00000000005D0000-0x00000000008F4000-memory.dmp family_quasar -
Drops file in System32 directory 2 IoCs
Processes:
Client-built.exedescription ioc process File created C:\Windows\system32\SubDir\updale.exe Client-built.exe File opened for modification C:\Windows\system32\SubDir\updale.exe Client-built.exe -
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
-
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
Client-built.exedescription pid process Token: SeDebugPrivilege 1504 Client-built.exe -
Suspicious use of WriteProcessMemory 2 IoCs
Processes:
Client-built.exedescription pid process target process PID 1504 wrote to memory of 1436 1504 Client-built.exe schtasks.exe PID 1504 wrote to memory of 1436 1504 Client-built.exe schtasks.exe -
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
PID:1504 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "windows av startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\updale.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:1436
-
C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4144 --field-trial-handle=2276,i,11674642242468042059,14711253743544118298,262144 --variations-seed-version /prefetch:81⤵PID:2720