quasar | 54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd

General

Target

Client-built.exe
Size

3.1MB
MD5

3a96e758409eeabc8836a8665980e01b
SHA1

50f6950089a997ccdac2c0790f4745bb84792a32
SHA256

54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd
SHA512

f07548c69a5280fbac5fa28c1cad876fe0329757990b6f04200f8d1ab2f30a87cfdb784d2cb3364d72b2538360200c79582a22d094bd5165890876b8003807c8
SSDEEP

49152:Sv2I22SsaNYfdPBldt698dBcjHgNxNESEbk/iOLoGdbTHHB72eh2NT:Svb22SsaNYfdPBldt6+dBcjHCxqw

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Inversin-43597.portmap.host:43597

Mutex

80329fd2-f063-4b06-9c7e-8dbc6278c2a3

Attributes

encryption_key
744EA1A385FEBC6DA96387411B7000D77E66B075
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java updater
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/2692-1-0x0000000001240000-0x0000000001564000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015cfd-6.dat	family_quasar
behavioral1/memory/3024-9-0x0000000000170000-0x0000000000494000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3024	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
2696	schtasks.exe
2108	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2692	Client-built.exe
Token: SeDebugPrivilege	3024	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3024	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3024	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2692 wrote to memory of 2696	2692	Client-built.exe	31
PID 2692 wrote to memory of 2696	2692	Client-built.exe	31
PID 2692 wrote to memory of 2696	2692	Client-built.exe	31
PID 2692 wrote to memory of 3024	2692	Client-built.exe	33
PID 2692 wrote to memory of 3024	2692	Client-built.exe	33
PID 2692 wrote to memory of 3024	2692	Client-built.exe	33
PID 3024 wrote to memory of 2108	3024	Client.exe	34
PID 3024 wrote to memory of 2108	3024	Client.exe	34
PID 3024 wrote to memory of 2108	3024	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:2692
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2696
- 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:3024
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2108

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

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
3a96e758409eeabc8836a8665980e01b

SHA1
50f6950089a997ccdac2c0790f4745bb84792a32

SHA256
54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd

SHA512
f07548c69a5280fbac5fa28c1cad876fe0329757990b6f04200f8d1ab2f30a87cfdb784d2cb3364d72b2538360200c79582a22d094bd5165890876b8003807c8

Download Submit
memory/2692-0-0x000007FEF61F3000-0x000007FEF61F4000-memory.dmp

Filesize
4KB

Download
memory/2692-1-0x0000000001240000-0x0000000001564000-memory.dmp

Filesize
3.1MB

Download
memory/2692-2-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2692-7-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/3024-9-0x0000000000170000-0x0000000000494000-memory.dmp

Filesize
3.1MB

Download
memory/3024-8-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/3024-10-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/3024-11-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads