quasar | f2e04196e1353ad216e077e0aeb2e1ab8ee93b8b16b205422b4cc6d8adc50cc2

Analysis

max time kernel
1794s
max time network
1802s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
31/03/2024, 00:43

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General

Target
Client-built.exe
Size 3.1MB
Sample240331-a2zn9aae61
SHA256 f2e04196e1353ad216e077e0aeb2e1ab8ee93b8b16b205422b4cc6d8adc50cc2
MD5 57045c2bf3377b12aa5abce21cc0a99d
SHA1 217202ed404f25fc550ad70fd7066b0fe8773ef9
SHA512 9ab46cc194eeaabb75777457a01328f5a8d2ebf604efba0623575cf25c04e206e416ee72db17e3c92a9d363330f82fa3ce2aac64c2a4a61d4dce34d79b73366e
SSDEEP 49152:Wv+I22SsaNYfdPBldt698dBcjHukuQPoGdhEQTHHB72eh2NT:Wvz22SsaNYfdPBldt6+dBcjHukuE
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar ratted spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Ratted

140.238.91.110:44867

Mutex

be049c71-d631-4f68-8b3e-8e01081f2340

Attributes

encryption_key
AA883CE7347A3543F81EBCDE3BBF3BFC9C60344E
install_name
WOS64UPD.exe
log_directory
Windows Update Logs
reconnect_delay
3000
startup_key
Windows Updater
subdirectory
Windows

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/4384-0-0x0000000000B80000-0x0000000000EA4000-memory.dmp	family_quasar
behavioral2/files/0x00020000000227ea-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4676	WOS64UPD.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
1700	schtasks.exe
4700	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4384	Client-built.exe
Token: SeDebugPrivilege	4676	WOS64UPD.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4676	WOS64UPD.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4384 wrote to memory of 1700	4384	Client-built.exe	93
PID 4384 wrote to memory of 1700	4384	Client-built.exe	93
PID 4384 wrote to memory of 4676	4384	Client-built.exe	95
PID 4384 wrote to memory of 4676	4384	Client-built.exe	95
PID 4676 wrote to memory of 4700	4676	WOS64UPD.exe	96
PID 4676 wrote to memory of 4700	4676	WOS64UPD.exe	96

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.
persistence

Query Registry
T1012

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:4384
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1700
- C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe
  "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4676
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:4700

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=3764 --field-trial-handle=2692,i,8678872182442199182,12502579059484928042,262144 --variations-seed-version /prefetch:8
1⤵
PID:2088

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=4536 --field-trial-handle=2692,i,8678872182442199182,12502579059484928042,262144 --variations-seed-version /prefetch:8
1⤵
PID:3876

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

WOS64UPD.exe

Path C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe
Size 3.1MB
SHA256 f2e04196e1353ad216e077e0aeb2e1ab8ee93b8b16b205422b4cc6d8adc50cc2
MD5 57045c2bf3377b12aa5abce21cc0a99d
SHA1 217202ed404f25fc550ad70fd7066b0fe8773ef9
SHA512 9ab46cc194eeaabb75777457a01328f5a8d2ebf604efba0623575cf25c04e206e416ee72db17e3c92a9d363330f82fa3ce2aac64c2a4a61d4dce34d79b73366e
SSDEEP 49152:Wv+I22SsaNYfdPBldt698dBcjHukuQPoGdhEQTHHB72eh2NT:Wvz22SsaNYfdPBldt6+dBcjHukuE
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/4384-0-0x0000000000B80000-0x0000000000EA4000-memory.dmp

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memory/4384-1-0x00007FF8A1FE0000-0x00007FF8A2AA1000-memory.dmp

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memory/4384-2-0x000000001BB40000-0x000000001BB50000-memory.dmp

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memory/4384-8-0x00007FF8A1FE0000-0x00007FF8A2AA1000-memory.dmp

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memory/4676-10-0x0000000003410000-0x0000000003420000-memory.dmp

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memory/4676-9-0x00007FF8A1FE0000-0x00007FF8A2AA1000-memory.dmp

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memory/4676-11-0x000000001CA50000-0x000000001CAA0000-memory.dmp

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memory/4676-12-0x000000001CB60000-0x000000001CC12000-memory.dmp

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memory/4676-15-0x000000001CAD0000-0x000000001CAE2000-memory.dmp

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memory/4676-16-0x000000001D260000-0x000000001D29C000-memory.dmp

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memory/4676-17-0x00007FF8A1FE0000-0x00007FF8A2AA1000-memory.dmp

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memory/4676-18-0x0000000003410000-0x0000000003420000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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