quasar | ef211cb6f339827eba4ab312b5b4a2b477798a233b975702e8d863e5a5c2f260

General

Target

ef211cb6f339827eba4ab312b5b4a2b477798a233b975702e8d863e5a5c2f260.exe
Size

2.1MB
MD5

087a67ee553b19774b9ce8f45c9532b3
SHA1

5a06e39e4000fb1480753d320e3b252c24b51c82
SHA256

ef211cb6f339827eba4ab312b5b4a2b477798a233b975702e8d863e5a5c2f260
SHA512

fe66c75ca8e55b3d4f34f742852f5821509510ec4dd614d3c7bcd857b3361c47ecb3e7871bf2c2c05362a3e4cfde935fdcf1a61c5995696ab78b30edad8bf274
SSDEEP

49152:3Djlabwz9L7bFVItZNvxxiXIHLyoltZMqzlsHbk:zqwhlVQLvxqIHL5t6qobk

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.97:4782

Mutex

ce58d4d7-5ffa-4b20-9aff-e05dd520bef2

Attributes

encryption_key
E7BFEA6A25E205DE16660AD01E8DE9BD5D2907A9
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/files/0x000800000001727e-7.dat	family_quasar
behavioral1/memory/2996-15-0x00000000000A0000-0x00000000003C4000-memory.dmp	family_quasar
behavioral1/memory/2892-23-0x0000000000AE0000-0x0000000000E04000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

Processes:

Client-built.exeClient.exe

pid	Process
2996	Client-built.exe
2892	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
2700	schtasks.exe
2740	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	2996	Client-built.exe
Token: SeDebugPrivilege	2892	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid	Process
2892	Client.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

ef211cb6f339827eba4ab312b5b4a2b477798a233b975702e8d863e5a5c2f260.exeClient-built.exeClient.exe

description	pid	Process	procid_target
PID 2340 wrote to memory of 2996	2340	ef211cb6f339827eba4ab312b5b4a2b477798a233b975702e8d863e5a5c2f260.exe	29
PID 2340 wrote to memory of 2996	2340	ef211cb6f339827eba4ab312b5b4a2b477798a233b975702e8d863e5a5c2f260.exe	29
PID 2340 wrote to memory of 2996	2340	ef211cb6f339827eba4ab312b5b4a2b477798a233b975702e8d863e5a5c2f260.exe	29
PID 2996 wrote to memory of 2700	2996	Client-built.exe	30
PID 2996 wrote to memory of 2700	2996	Client-built.exe	30
PID 2996 wrote to memory of 2700	2996	Client-built.exe	30
PID 2996 wrote to memory of 2892	2996	Client-built.exe	32
PID 2996 wrote to memory of 2892	2996	Client-built.exe	32
PID 2996 wrote to memory of 2892	2996	Client-built.exe	32
PID 2892 wrote to memory of 2740	2892	Client.exe	33
PID 2892 wrote to memory of 2740	2892	Client.exe	33
PID 2892 wrote to memory of 2740	2892	Client.exe	33

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\ef211cb6f339827eba4ab312b5b4a2b477798a233b975702e8d863e5a5c2f260.exe
"C:\Users\Admin\AppData\Local\Temp\ef211cb6f339827eba4ab312b5b4a2b477798a233b975702e8d863e5a5c2f260.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2340
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\Client-built.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Client-built.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2996
- - 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
- - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2892
  - - 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
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2740

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\Client-built.exe

Filesize
3.1MB

MD5
1ce028c7fcd75ceadf48a00e6e8b3414

SHA1
ab34c6edd50267ddba0ad59c6fc4963e79348a4c

SHA256
8290155eb76bfffd148ad64980d9d3bdeb4ea04649ef0b7c89e36fd98e8e0369

SHA512
e16877d56fad7d05f67ca08d5ae39ec4e3ac380fccc99ff67ab66129b0333789bc324b556d4ca04f90e15d95c9beb9560d74488d22765a1ec0893f1bd4c46148

Download Submit
memory/2340-4-0x0000000003600000-0x0000000003610000-memory.dmp

Filesize
64KB

Download
memory/2892-23-0x0000000000AE0000-0x0000000000E04000-memory.dmp

Filesize
3.1MB

Download
memory/2996-14-0x000007FEF62A3000-0x000007FEF62A4000-memory.dmp

Filesize
4KB

Download
memory/2996-15-0x00000000000A0000-0x00000000003C4000-memory.dmp

Filesize
3.1MB

Download
memory/2996-16-0x000007FEF62A0000-0x000007FEF6C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2996-22-0x000007FEF62A0000-0x000007FEF6C8C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads