quasar | cfb7003085b0091a90edb102a6ddfea8c3bae48460994e733fa5134bdec9dfa9

Analysis

max time kernel
422s
max time network
491s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
17-11-2024 00:13

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General

Target

AHHAFS.exe
Size

3.1MB
MD5

63549bde2568a8d9fe3636559ff908fa
SHA1

e86ba5584ee39d224ac7662041d99e85ac8b4f43
SHA256

cfb7003085b0091a90edb102a6ddfea8c3bae48460994e733fa5134bdec9dfa9
SHA512

c64902094fe7b036c3681cc2eced4cb4872d1a6a0e02c4cb1ac2f74ee8d2c9d4570dafeeba39e0ffdf13d5365c60d0c8dc21eb9d42d0d673e16eafdbc5296f04
SSDEEP

49152:/vyI22SsaNYfdPBldt698dBcjHU2RJ6/bR3LoGdFTHHB72eh2NT:/vf22SsaNYfdPBldt6+dBcjHU2RJ6R

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

serveo.net:4782

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
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 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/3416-1-0x0000000000700000-0x0000000000A24000-memory.dmp	family_quasar
behavioral1/files/0x00290000000450cf-3.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
3388	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
4440	schtasks.exe
1496	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AHHAFS.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	3416	AHHAFS.exe
Token: SeDebugPrivilege	3388	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid	Process
3388	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

AHHAFS.exeClient.exe

description	pid	Process	procid_target
PID 3416 wrote to memory of 4440	3416	AHHAFS.exe	81
PID 3416 wrote to memory of 4440	3416	AHHAFS.exe	81
PID 3416 wrote to memory of 3388	3416	AHHAFS.exe	83
PID 3416 wrote to memory of 3388	3416	AHHAFS.exe	83
PID 3388 wrote to memory of 1496	3388	Client.exe	89
PID 3388 wrote to memory of 1496	3388	Client.exe	89

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\AHHAFS.exe
"C:\Users\Admin\AppData\Local\Temp\AHHAFS.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3416
- 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:4440
- 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:3388
- - 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:1496

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

Replay Monitor

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Downloads

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

Filesize
3.1MB

MD5
63549bde2568a8d9fe3636559ff908fa

SHA1
e86ba5584ee39d224ac7662041d99e85ac8b4f43

SHA256
cfb7003085b0091a90edb102a6ddfea8c3bae48460994e733fa5134bdec9dfa9

SHA512
c64902094fe7b036c3681cc2eced4cb4872d1a6a0e02c4cb1ac2f74ee8d2c9d4570dafeeba39e0ffdf13d5365c60d0c8dc21eb9d42d0d673e16eafdbc5296f04

Download Submit
memory/3388-6-0x00007FF9E51E0000-0x00007FF9E5CA2000-memory.dmp

Filesize
10.8MB

Download
memory/3388-7-0x00007FF9E51E0000-0x00007FF9E5CA2000-memory.dmp

Filesize
10.8MB

Download
memory/3388-8-0x000000001C160000-0x000000001C1B0000-memory.dmp

Filesize
320KB

Download
memory/3388-9-0x000000001C270000-0x000000001C322000-memory.dmp

Filesize
712KB

Download
memory/3388-12-0x000000001C1E0000-0x000000001C1F2000-memory.dmp

Filesize
72KB

Download
memory/3388-13-0x000000001CD70000-0x000000001CDAC000-memory.dmp

Filesize
240KB

Download
memory/3388-14-0x00007FF9E51E0000-0x00007FF9E5CA2000-memory.dmp

Filesize
10.8MB

Download
memory/3416-0-0x00007FF9E51E3000-0x00007FF9E51E5000-memory.dmp

Filesize
8KB

Download
memory/3416-1-0x0000000000700000-0x0000000000A24000-memory.dmp

Filesize
3.1MB

Download
memory/3416-2-0x00007FF9E51E0000-0x00007FF9E5CA2000-memory.dmp

Filesize
10.8MB

Download
memory/3416-5-0x00007FF9E51E0000-0x00007FF9E5CA2000-memory.dmp

Filesize
10.8MB

Download