quasar | 3ad07a1878c8b77f9fc0143d8f88c240d8d0b986d015d4c0cd881ad9c0d572e1 | Triage

Analysis

max time kernel
297s
max time network
299s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-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
behavioral1/memory/2476-0-0x0000000000830000-0x0000000000B54000-memory.dmp	family_quasar
behavioral1/files/0x000b000000015bb9-5.dat	family_quasar
behavioral1/memory/2964-9-0x0000000000F50000-0x0000000001274000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2964	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
2968	schtasks.exe
2544	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2476	Client-built.exe
Token: SeDebugPrivilege	2964	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2964	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2476 wrote to memory of 2968	2476	Client-built.exe	28
PID 2476 wrote to memory of 2968	2476	Client-built.exe	28
PID 2476 wrote to memory of 2968	2476	Client-built.exe	28
PID 2476 wrote to memory of 2964	2476	Client-built.exe	30
PID 2476 wrote to memory of 2964	2476	Client-built.exe	30
PID 2476 wrote to memory of 2964	2476	Client-built.exe	30
PID 2964 wrote to memory of 2544	2964	Client.exe	31
PID 2964 wrote to memory of 2544	2964	Client.exe	31
PID 2964 wrote to memory of 2544	2964	Client.exe	31

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:2476
- 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:2968
- 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:2964
- - 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:2544

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/2476-0-0x0000000000830000-0x0000000000B54000-memory.dmp

Filesize
3.1MB

Download
memory/2476-1-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

Filesize
9.9MB

Download
memory/2476-2-0x000000001B210000-0x000000001B290000-memory.dmp

Filesize
512KB

Download
memory/2476-8-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

Filesize
9.9MB

Download
memory/2964-7-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

Filesize
9.9MB

Download
memory/2964-9-0x0000000000F50000-0x0000000001274000-memory.dmp

Filesize
3.1MB

Download
memory/2964-10-0x000000001B150000-0x000000001B1D0000-memory.dmp

Filesize
512KB

Download
memory/2964-11-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

Filesize
9.9MB

Download
memory/2964-12-0x000000001B150000-0x000000001B1D0000-memory.dmp

Filesize
512KB

Download