quasar | 3ad07a1878c8b77f9fc0143d8f88c240d8d0b986d015d4c0cd881ad9c0d572e1 | Triage

Analysis

max time kernel
298s
max time network
308s
platform
windows10-1703_x64
resource
win10-20240221-en
resource tags

arch:x64arch:x86image:win10-20240221-enlocale:en-usos:windows10-1703-x64system
submitted
28/03/2024, 00:27

Sharing

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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 2 IoCs

resource	yara_rule
behavioral2/memory/660-0-0x0000000000E80000-0x00000000011A4000-memory.dmp	family_quasar
behavioral2/files/0x000600000001abd7-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2740	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
1492	schtasks.exe
392	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	660	Client-built.exe
Token: SeDebugPrivilege	2740	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2740	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 660 wrote to memory of 1492	660	Client-built.exe	72
PID 660 wrote to memory of 1492	660	Client-built.exe	72
PID 660 wrote to memory of 2740	660	Client-built.exe	74
PID 660 wrote to memory of 2740	660	Client-built.exe	74
PID 2740 wrote to memory of 392	2740	Client.exe	75
PID 2740 wrote to memory of 392	2740	Client.exe	75

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:660
- 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:1492
- 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:2740
- - 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:392

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
3.1MB

MD5
6efb136f01bd7beeec9603924b79f5d0

SHA1
8794dd0e858759eea062ebc227417f712a8d2af0

SHA256
3ad07a1878c8b77f9fc0143d8f88c240d8d0b986d015d4c0cd881ad9c0d572e1

SHA512
102ca624f0fefff74f4e9a6d5a173861b3887f24e608245370adabc11cd385805ed18f5208ab5a33f05131a42edf04d234b146184e954e9d83f40b8149353548

Download Submit
memory/660-0-0x0000000000E80000-0x00000000011A4000-memory.dmp

Filesize
3.1MB

Download
memory/660-1-0x00007FFE58CF0000-0x00007FFE596DC000-memory.dmp

Filesize
9.9MB

Download
memory/660-2-0x000000001BF80000-0x000000001BF90000-memory.dmp

Filesize
64KB

Download
memory/660-9-0x00007FFE58CF0000-0x00007FFE596DC000-memory.dmp

Filesize
9.9MB

Download
memory/2740-8-0x00007FFE58CF0000-0x00007FFE596DC000-memory.dmp

Filesize
9.9MB

Download
memory/2740-10-0x000000001BB90000-0x000000001BBA0000-memory.dmp

Filesize
64KB

Download
memory/2740-11-0x000000001BA10000-0x000000001BA60000-memory.dmp

Filesize
320KB

Download
memory/2740-12-0x000000001C2A0000-0x000000001C352000-memory.dmp

Filesize
712KB

Download
memory/2740-13-0x00007FFE58CF0000-0x00007FFE596DC000-memory.dmp

Filesize
9.9MB

Download
memory/2740-14-0x000000001BB90000-0x000000001BBA0000-memory.dmp

Filesize
64KB

Download