quasar | 60c5af78dbbde0379ee14544cd4f98cead5f516842fcbb94b3b1e035b82c0ac4

General

Target

Client-built.exe
Size

3.1MB
MD5

06550a7d85870e79df0d9a55fb3bac98
SHA1

ed011b024814c737519d026bec4138ef8569d779
SHA256

60c5af78dbbde0379ee14544cd4f98cead5f516842fcbb94b3b1e035b82c0ac4
SHA512

51e48bf7e4f3a5b9f7b6806153423f9c484cc1405260a283539efad7c21cd50327b9670fb9f06cd25239d50e3fa7d168ec831a856d8b52d9ace2f63425bfb163
SSDEEP

49152:Tvae821/aQWl8P0lSk3aKA3Z+nMwRJ6ObR3LoGdhUKSTHHB72eh2NT:Tvx821/aQWl8P0lSk3DA3Z+nMwRJ6I

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.145:4782

192.168.56.1:4784

192.168.1.145:4784

192.168.1.254:4784

Mutex

9d952f82-b8b7-4948-b2b7-53c225a63ebb

Attributes

encryption_key
AAB9DCB0841C8C889A6BCA76764D0770416B2FE1
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

resource	yara_rule
behavioral1/memory/1676-1-0x0000000001000000-0x0000000001324000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016de8-6.dat	family_quasar
behavioral1/memory/1496-9-0x00000000010C0000-0x00000000013E4000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
1496	Client.exe
1904	Client.exe

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

System Information Discovery
T1082

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2016	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2016	PING.EXE

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2020	schtasks.exe
2404	schtasks.exe
2928	schtasks.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1676	Client-built.exe
Token: SeDebugPrivilege	1496	Client.exe
Token: SeDebugPrivilege	1904	Client.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1496	Client.exe
1904	Client.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1676 wrote to memory of 2404	1676	Client-built.exe	30
PID 1676 wrote to memory of 2404	1676	Client-built.exe	30
PID 1676 wrote to memory of 2404	1676	Client-built.exe	30
PID 1676 wrote to memory of 1496	1676	Client-built.exe	32
PID 1676 wrote to memory of 1496	1676	Client-built.exe	32
PID 1676 wrote to memory of 1496	1676	Client-built.exe	32
PID 1496 wrote to memory of 2928	1496	Client.exe	33
PID 1496 wrote to memory of 2928	1496	Client.exe	33
PID 1496 wrote to memory of 2928	1496	Client.exe	33
PID 1496 wrote to memory of 1968	1496	Client.exe	36
PID 1496 wrote to memory of 1968	1496	Client.exe	36
PID 1496 wrote to memory of 1968	1496	Client.exe	36
PID 1968 wrote to memory of 588	1968	cmd.exe	38
PID 1968 wrote to memory of 588	1968	cmd.exe	38
PID 1968 wrote to memory of 588	1968	cmd.exe	38
PID 1968 wrote to memory of 2016	1968	cmd.exe	39
PID 1968 wrote to memory of 2016	1968	cmd.exe	39
PID 1968 wrote to memory of 2016	1968	cmd.exe	39
PID 1968 wrote to memory of 1904	1968	cmd.exe	40
PID 1968 wrote to memory of 1904	1968	cmd.exe	40
PID 1968 wrote to memory of 1904	1968	cmd.exe	40
PID 1904 wrote to memory of 2020	1904	Client.exe	41
PID 1904 wrote to memory of 2020	1904	Client.exe	41
PID 1904 wrote to memory of 2020	1904	Client.exe	41

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:1676
- 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:2404
- 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:1496
- - 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:2928
- - C:\Windows\system32\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\M6su03uv7v8q.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1968
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:588
  - - C:\Windows\system32\PING.EXE
      ping -n 10 localhost
      4⤵
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2016
  - - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:1904
    - - 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
        5⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:2020

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

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\M6su03uv7v8q.bat

Filesize
207B

MD5
55afb9e9272d8fba7a0e79d4f1ef1791

SHA1
d610c6562317b42ab13f34e1a80176bfa4f280f0

SHA256
34419e60c16be8b8aeaf62ce8a516da8a2225aced12ecc231f0dc476485869d9

SHA512
2e6e75ab0ea1ff8cc8d7a5d1ed5d018550c2b85a41cb40186eab962f7db8f9b1c8382a837c2f61c496873a43b528b1e6c841aa1b551ef66baac17c91566e04b9

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

Filesize
3.1MB

MD5
06550a7d85870e79df0d9a55fb3bac98

SHA1
ed011b024814c737519d026bec4138ef8569d779

SHA256
60c5af78dbbde0379ee14544cd4f98cead5f516842fcbb94b3b1e035b82c0ac4

SHA512
51e48bf7e4f3a5b9f7b6806153423f9c484cc1405260a283539efad7c21cd50327b9670fb9f06cd25239d50e3fa7d168ec831a856d8b52d9ace2f63425bfb163

Download Submit
memory/1496-9-0x00000000010C0000-0x00000000013E4000-memory.dmp

Filesize
3.1MB

Download
memory/1496-10-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download
memory/1496-11-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download
memory/1496-12-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download
memory/1496-22-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download
memory/1676-0-0x000007FEF6343000-0x000007FEF6344000-memory.dmp

Filesize
4KB

Download
memory/1676-1-0x0000000001000000-0x0000000001324000-memory.dmp

Filesize
3.1MB

Download
memory/1676-2-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download
memory/1676-8-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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