quasar | f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2e

Analysis

max time kernel
92s
max time network
108s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
31-12-2024 22:17

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General

Target

f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe
Size

3.1MB
MD5

72194b4da4b58d78e3c766af20a0b5a0
SHA1

c7e14ffaa30aa186babbfab5de102efd4a676a21
SHA256

f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2e
SHA512

6f70cd60703420cafd1fa8d3197dd7ee382d94f991b141ae30042ba70afc15a97fb522797625074449c1648f2d5532cc84023c088e5fd17b53a8059769486d71
SSDEEP

49152:rvyI22SsaNYfdPBldt698dBcjH2QRJ6WbR3LoGdgcTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjH2QRJ6QQ

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

50.114.115.135:4782

Mutex

1e0c60c5-a4af-4c26-a7f1-5ee890a8321a

Attributes

encryption_key
26CBB40F2457EA2E776A5BB10B783B74E5FD47D3
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

resource	yara_rule
behavioral2/memory/4588-1-0x0000000000E30000-0x0000000001154000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b97-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1544	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

pid	Process
1392	schtasks.exe
4252	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4588	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe
Token: SeDebugPrivilege	1544	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1544	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4588 wrote to memory of 1392	4588	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	84
PID 4588 wrote to memory of 1392	4588	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	84
PID 4588 wrote to memory of 1544	4588	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	86
PID 4588 wrote to memory of 1544	4588	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	86
PID 1544 wrote to memory of 4252	1544	Client.exe	87
PID 1544 wrote to memory of 4252	1544	Client.exe	87

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\f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe
"C:\Users\Admin\AppData\Local\Temp\f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4588
- 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:1392
- 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:1544
- - 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:4252

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
72194b4da4b58d78e3c766af20a0b5a0

SHA1
c7e14ffaa30aa186babbfab5de102efd4a676a21

SHA256
f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2e

SHA512
6f70cd60703420cafd1fa8d3197dd7ee382d94f991b141ae30042ba70afc15a97fb522797625074449c1648f2d5532cc84023c088e5fd17b53a8059769486d71

Download Submit
memory/1544-9-0x00007FFEEB9B0000-0x00007FFEEC471000-memory.dmp

Filesize
10.8MB

Download
memory/1544-11-0x00007FFEEB9B0000-0x00007FFEEC471000-memory.dmp

Filesize
10.8MB

Download
memory/1544-12-0x0000000002D40000-0x0000000002D90000-memory.dmp

Filesize
320KB

Download
memory/1544-13-0x000000001C1F0000-0x000000001C2A2000-memory.dmp

Filesize
712KB

Download
memory/1544-16-0x0000000002DD0000-0x0000000002DE2000-memory.dmp

Filesize
72KB

Download
memory/1544-17-0x000000001B950000-0x000000001B98C000-memory.dmp

Filesize
240KB

Download
memory/1544-18-0x00007FFEEB9B0000-0x00007FFEEC471000-memory.dmp

Filesize
10.8MB

Download
memory/4588-0-0x00007FFEEB9B3000-0x00007FFEEB9B5000-memory.dmp

Filesize
8KB

Download
memory/4588-1-0x0000000000E30000-0x0000000001154000-memory.dmp

Filesize
3.1MB

Download
memory/4588-2-0x00007FFEEB9B0000-0x00007FFEEC471000-memory.dmp

Filesize
10.8MB

Download
memory/4588-10-0x00007FFEEB9B0000-0x00007FFEEC471000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads