quasar | e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff

Analysis

max time kernel
32s
max time network
36s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
02-11-2024 14:17

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General

Target

Pearjumper.exe
Size

3.1MB
MD5

5dd91af5b6d1e8f38ccf83f6cf24e93d
SHA1

978d27dfe11619fbd71333d63741da0b3a21b7d2
SHA256

e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff
SHA512

6b6e61f8419e234eeb233eeb0f402434f5905492831588a3a488caf02ca9a60bc21a4b94acf7982d3dc533afe801341220a51d1fb33bc14dcc1cca1c44f8c03b
SSDEEP

49152:OvyI22SsaNYfdPBldt698dBcjHagRS/koGwgRYTHHB72eh2NT:Ovf22SsaNYfdPBldt6+dBcjHagRS8d

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.4.26:4782

Mutex

8ee4e652-9e5a-432b-95de-d75a01767545

Attributes

encryption_key
4F71DD3E5776310D88190A9E0349AF91D019E4F6
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2024-1-0x0000000000150000-0x0000000000474000-memory.dmp	family_quasar
behavioral1/files/0x0009000000016ccc-6.dat	family_quasar
behavioral1/memory/2884-9-0x00000000012C0000-0x00000000015E4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
2884	Client.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exe

pid	Process
1724	schtasks.exe
2700	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Pearjumper.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	2024	Pearjumper.exe
Token: SeDebugPrivilege	2884	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid	Process
2884	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Pearjumper.exeClient.exe

description	pid	Process	procid_target
PID 2024 wrote to memory of 1724	2024	Pearjumper.exe	31
PID 2024 wrote to memory of 1724	2024	Pearjumper.exe	31
PID 2024 wrote to memory of 1724	2024	Pearjumper.exe	31
PID 2024 wrote to memory of 2884	2024	Pearjumper.exe	33
PID 2024 wrote to memory of 2884	2024	Pearjumper.exe	33
PID 2024 wrote to memory of 2884	2024	Pearjumper.exe	33
PID 2884 wrote to memory of 2700	2884	Client.exe	34
PID 2884 wrote to memory of 2700	2884	Client.exe	34
PID 2884 wrote to memory of 2700	2884	Client.exe	34

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\Pearjumper.exe
"C:\Users\Admin\AppData\Local\Temp\Pearjumper.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2024
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1724
- 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:2884
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.1MB

MD5
5dd91af5b6d1e8f38ccf83f6cf24e93d

SHA1
978d27dfe11619fbd71333d63741da0b3a21b7d2

SHA256
e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff

SHA512
6b6e61f8419e234eeb233eeb0f402434f5905492831588a3a488caf02ca9a60bc21a4b94acf7982d3dc533afe801341220a51d1fb33bc14dcc1cca1c44f8c03b

Download Submit
memory/2024-0-0x000007FEF5833000-0x000007FEF5834000-memory.dmp

Filesize
4KB

Download
memory/2024-1-0x0000000000150000-0x0000000000474000-memory.dmp

Filesize
3.1MB

Download
memory/2024-2-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

Filesize
9.9MB

Download
memory/2024-8-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

Filesize
9.9MB

Download
memory/2884-9-0x00000000012C0000-0x00000000015E4000-memory.dmp

Filesize
3.1MB

Download
memory/2884-10-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

Filesize
9.9MB

Download
memory/2884-11-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

Filesize
9.9MB

Download
memory/2884-12-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

Filesize
9.9MB

Download