quasar | 3ad07a1878c8b77f9fc0143d8f88c240d8d0b986d015d4c0cd881ad9c0d572e1 | Triage

Analysis

max time kernel
298s
max time network
303s
platform
windows11-21h2_x64
resource
win11-20240214-en
resource tags

arch:x64arch:x86image:win11-20240214-enlocale:en-usos:windows11-21h2-x64system
submitted
28/03/2024, 00:27

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General

Target

Client-built.exe
Size

3.1MB
MD5

6efb136f01bd7beeec9603924b79f5d0
SHA1

8794dd0e858759eea062ebc227417f712a8d2af0
SHA256

3ad07a1878c8b77f9fc0143d8f88c240d8d0b986d015d4c0cd881ad9c0d572e1
SHA512

102ca624f0fefff74f4e9a6d5a173861b3887f24e608245370adabc11cd385805ed18f5208ab5a33f05131a42edf04d234b146184e954e9d83f40b8149353548
SSDEEP

49152:2vtt62XlaSFNWPjljiFa2RoUYInH8FEFUCk/bvLoGdrjTHHB72eh2NT:2vP62XlaSFNWPjljiFXRoUYIH8dz

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

91.92.254.40:4782

Mutex

56928f7b-c5c9-4b24-af59-8c509ce1d27e

Attributes

encryption_key
60574F1741A0786C827AF49C652AB3A7DA0533D1
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows System
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral4/memory/5056-0-0x0000000000650000-0x0000000000974000-memory.dmp	family_quasar
behavioral4/files/0x000200000002a759-5.dat	family_quasar
behavioral4/files/0x000200000002a759-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3788	Client.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

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

Scheduled Task/Job

pid	Process
1804	schtasks.exe
3436	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5056	Client-built.exe
Token: SeDebugPrivilege	3788	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3788	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5056 wrote to memory of 1804	5056	Client-built.exe	77
PID 5056 wrote to memory of 1804	5056	Client-built.exe	77
PID 5056 wrote to memory of 3788	5056	Client-built.exe	79
PID 5056 wrote to memory of 3788	5056	Client-built.exe	79
PID 3788 wrote to memory of 3436	3788	Client.exe	80
PID 3788 wrote to memory of 3436	3788	Client.exe	80

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:5056
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows System" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1804
- 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:3788
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows System" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3436

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Scheduled Task/Job

Privilege Escalation

Scheduled Task/Job

Defense Evasion

Credential Access

Discovery

Query Registry

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
1.1MB

MD5
901fe47d7001f17f657b8d977396edb6

SHA1
a1018f070b1c2d49c72373b0b30e4e6be57dd895

SHA256
739e6650867943050deb43d5cf2c236deb6f3587acd8838047c05564fbd3cf07

SHA512
6f58683364fec89c7ae05c64561273eda723ce9b42c7570e48a4ee63a58cfd2369316570eacaf2d8957d922ed9494390881afc76b3c4ec7f444ea87460caf50f

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
832KB

MD5
8ad90043bb19719a6b85899fafafcecc

SHA1
1eac05d629ab358f24c935035e40e75498f42637

SHA256
a4566316b91e3b938908237fa51669bfb3aeb74ed594a008c910627bd11c11ca

SHA512
7fc046444b5090df997f2a5cdd05c13531023383be0d9447a5e8c908c9b970232ca344a83694ec9daf074707c82f0f6c4ac124d3572aba76bb5158fe80ed2955

Download Submit
memory/3788-8-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

Filesize
10.8MB

Download
memory/3788-10-0x000000001BA90000-0x000000001BAA0000-memory.dmp

Filesize
64KB

Download
memory/3788-11-0x000000001C590000-0x000000001C5E0000-memory.dmp

Filesize
320KB

Download
memory/3788-12-0x000000001C6A0000-0x000000001C752000-memory.dmp

Filesize
712KB

Download
memory/3788-13-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

Filesize
10.8MB

Download
memory/5056-0-0x0000000000650000-0x0000000000974000-memory.dmp

Filesize
3.1MB

Download
memory/5056-1-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

Filesize
10.8MB

Download
memory/5056-2-0x000000001B890000-0x000000001B8A0000-memory.dmp

Filesize
64KB

Download
memory/5056-9-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

Filesize
10.8MB

Download