quasar | 411404c25495ed9c16504a74d9697965f240e11932dcbc987598453f00502efb

General

Target

Client-built.exe
Size

3.1MB
MD5

bcfb625c8bdc9d6f55e16fc7c363292f
SHA1

a5da3ba7826fcbe4b1e53d1a8faab851d65b9e5d
SHA256

411404c25495ed9c16504a74d9697965f240e11932dcbc987598453f00502efb
SHA512

b39bc965b5b0eb7207d31276e9d04830c9af4201613a9854595e3c78d3c0e13b7e5af3ae14a22b08b24b6063eaf8856db7a986546901941be301cc03707944fa
SSDEEP

49152:SviI22SsaNYfdPBldt698dBcjHBCj1JOLoGd+bTHHB72eh2NT:Svv22SsaNYfdPBldt6+dBcjHBCs

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.178.152:4782

Mutex

bacc9e85-2eef-4433-8941-a9c611b9e303

Attributes

encryption_key
D40083F8A2F2D1B1C3C76364F5615E487354F5D3
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows 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/2736-1-0x0000000001140000-0x0000000001464000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015d07-6.dat	family_quasar
behavioral1/memory/2852-9-0x0000000000BD0000-0x0000000000EF4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2852	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

pid	Process
2640	schtasks.exe
2708	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2736	Client-built.exe
Token: SeDebugPrivilege	2852	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2852	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2852	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2852	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2736 wrote to memory of 2640	2736	Client-built.exe	31
PID 2736 wrote to memory of 2640	2736	Client-built.exe	31
PID 2736 wrote to memory of 2640	2736	Client-built.exe	31
PID 2736 wrote to memory of 2852	2736	Client-built.exe	33
PID 2736 wrote to memory of 2852	2736	Client-built.exe	33
PID 2736 wrote to memory of 2852	2736	Client-built.exe	33
PID 2852 wrote to memory of 2708	2852	Client.exe	34
PID 2852 wrote to memory of 2708	2852	Client.exe	34
PID 2852 wrote to memory of 2708	2852	Client.exe	34

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:2736
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Windows Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2640
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2852
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Windows Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2708

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
bcfb625c8bdc9d6f55e16fc7c363292f

SHA1
a5da3ba7826fcbe4b1e53d1a8faab851d65b9e5d

SHA256
411404c25495ed9c16504a74d9697965f240e11932dcbc987598453f00502efb

SHA512
b39bc965b5b0eb7207d31276e9d04830c9af4201613a9854595e3c78d3c0e13b7e5af3ae14a22b08b24b6063eaf8856db7a986546901941be301cc03707944fa

Download Submit
memory/2736-0-0x000007FEF6623000-0x000007FEF6624000-memory.dmp

Filesize
4KB

Download
memory/2736-1-0x0000000001140000-0x0000000001464000-memory.dmp

Filesize
3.1MB

Download
memory/2736-2-0x000007FEF6620000-0x000007FEF700C000-memory.dmp

Filesize
9.9MB

Download
memory/2736-8-0x000007FEF6620000-0x000007FEF700C000-memory.dmp

Filesize
9.9MB

Download
memory/2852-10-0x000007FEF6620000-0x000007FEF700C000-memory.dmp

Filesize
9.9MB

Download
memory/2852-9-0x0000000000BD0000-0x0000000000EF4000-memory.dmp

Filesize
3.1MB

Download
memory/2852-11-0x000007FEF6620000-0x000007FEF700C000-memory.dmp

Filesize
9.9MB

Download
memory/2852-12-0x000007FEF6620000-0x000007FEF700C000-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