quasar | 4c64099954d9c5b52e0a8e6f4e9c8ef77d0ec794e0aa961458c8d6197dd85f2a

Reason

Machine shutdown

General

Target

Client-built.exe
Size

3.1MB
MD5

4993cdfc1ef30c150ca20742d088cbd2
SHA1

288ac4b4180095a9e861ea515003e5444d159a1a
SHA256

4c64099954d9c5b52e0a8e6f4e9c8ef77d0ec794e0aa961458c8d6197dd85f2a
SHA512

fe4ee1108d0703896915ea1ded61200ab6b435644993a1b512a5c5bcae8f4fc36f9400b1dfa3eea6aa9f93534f5dfac37a0a06f1543fedfa90e878aa2505a2b2
SSDEEP

49152:Ujrn5bI/WZUWXUm40iEBbPldJfAN3UR0GEbRxOoGVmTHHB72eh2NT:Ujj5bI/WZUiF40iEBbPldJfAN3UR0GN

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Name123forreal-31171.portmap.host:31171

Mutex

f9634259-eba6-40ac-8644-2c8e433257e9

Attributes

encryption_key
5FD1DA98B24B21C2214C328FD3F0A48F15BBCD2B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Window Defender Startup
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral3/memory/1132-1-0x00000000006D0000-0x00000000009F4000-memory.dmp	family_quasar
behavioral3/files/0x001d00000002aabf-6.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
4604	Client.exe

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

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

Processes:

taskkill.exe

pid	Process
5036	taskkill.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
2368	schtasks.exe
2960	schtasks.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Client-built.exeClient.exetaskkill.exe

description	pid	Process
Token: SeDebugPrivilege	1132	Client-built.exe
Token: SeDebugPrivilege	4604	Client.exe
Token: SeDebugPrivilege	5036	taskkill.exe

Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Client.exe

pid	Process
4604	Client.exe
4604	Client.exe

Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Client.exe

pid	Process
4604	Client.exe
4604	Client.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

Client-built.exeClient.execmd.exe

description	pid	Process	procid_target
PID 1132 wrote to memory of 2368	1132	Client-built.exe	77
PID 1132 wrote to memory of 2368	1132	Client-built.exe	77
PID 1132 wrote to memory of 4604	1132	Client-built.exe	79
PID 1132 wrote to memory of 4604	1132	Client-built.exe	79
PID 4604 wrote to memory of 2960	4604	Client.exe	80
PID 4604 wrote to memory of 2960	4604	Client.exe	80
PID 4604 wrote to memory of 4644	4604	Client.exe	83
PID 4604 wrote to memory of 4644	4604	Client.exe	83
PID 4644 wrote to memory of 3560	4644	cmd.exe	85
PID 4644 wrote to memory of 3560	4644	cmd.exe	85
PID 4644 wrote to memory of 5036	4644	cmd.exe	86
PID 4644 wrote to memory of 5036	4644	cmd.exe	86

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:1132
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Window Defender Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2368
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:4604
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Window Defender Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2960
- - C:\Windows\SYSTEM32\cmd.exe
    "cmd" /K CHCP 437
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4644
  - - C:\Windows\system32\chcp.com
      CHCP 437
      4⤵
      PID:3560
  - - C:\Windows\system32\taskkill.exe
      taskkill.exe /f /im svchost.exe
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:5036

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\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
4993cdfc1ef30c150ca20742d088cbd2

SHA1
288ac4b4180095a9e861ea515003e5444d159a1a

SHA256
4c64099954d9c5b52e0a8e6f4e9c8ef77d0ec794e0aa961458c8d6197dd85f2a

SHA512
fe4ee1108d0703896915ea1ded61200ab6b435644993a1b512a5c5bcae8f4fc36f9400b1dfa3eea6aa9f93534f5dfac37a0a06f1543fedfa90e878aa2505a2b2

Download Submit
memory/1132-0-0x00007FFF1D2C3000-0x00007FFF1D2C5000-memory.dmp

Filesize
8KB

Download
memory/1132-1-0x00000000006D0000-0x00000000009F4000-memory.dmp

Filesize
3.1MB

Download
memory/1132-2-0x00007FFF1D2C0000-0x00007FFF1DD82000-memory.dmp

Filesize
10.8MB

Download
memory/1132-10-0x00007FFF1D2C0000-0x00007FFF1DD82000-memory.dmp

Filesize
10.8MB

Download
memory/4604-9-0x00007FFF1D2C0000-0x00007FFF1DD82000-memory.dmp

Filesize
10.8MB

Download
memory/4604-11-0x00007FFF1D2C0000-0x00007FFF1DD82000-memory.dmp

Filesize
10.8MB

Download
memory/4604-12-0x000000001C350000-0x000000001C3A0000-memory.dmp

Filesize
320KB

Download
memory/4604-13-0x000000001C460000-0x000000001C512000-memory.dmp

Filesize
712KB

Download
memory/4604-16-0x000000001C3C0000-0x000000001C3D2000-memory.dmp

Filesize
72KB

Download
memory/4604-17-0x000000001C420000-0x000000001C45C000-memory.dmp

Filesize
240KB

Download
memory/4604-18-0x00007FFF1D2C0000-0x00007FFF1DD82000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads