quasar | 4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9

General

Target

4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe
Size

3.1MB
MD5

641cb02c429feb106094750765d0d6af
SHA1

db5be32e7ef7c5e93b7ef4f06bd6854f3a393cbd
SHA256

4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9
SHA512

8c4baa95d860c22e0ede96da48136db417f61ec6b19fccb847d0317f775e77d1e299f80e2f19230055fabf9e91ec8dbb2d90b055ddeb75b4c714c971afbf37b9
SSDEEP

49152:TIMa8I9WtxU/Pom7ZlHMgK+YISxoJXFacCbG1JoQoGdLTHHB72eh2NT:TI38I9WtxU/Pom7ZlHMg8ISxoJXEcC4

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

39.102.36.209:4782

Mutex

6d2ccfb9-4bf8-4a23-933c-5674d8e6fac2

Attributes

encryption_key
F48794CF898BB4C5B6223D4F472D7C5E4AD2EF9D
install_name
Clienty.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 payload 3 IoCs

resource	yara_rule
behavioral1/memory/2168-1-0x0000000000850000-0x0000000000B74000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016df8-6.dat	family_quasar
behavioral1/memory/2704-10-0x0000000001350000-0x0000000001674000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2704	Clienty.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

pid	Process
2748	schtasks.exe
2668	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2168	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe
Token: SeDebugPrivilege	2704	Clienty.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2704	Clienty.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2168 wrote to memory of 2748	2168	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	30
PID 2168 wrote to memory of 2748	2168	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	30
PID 2168 wrote to memory of 2748	2168	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	30
PID 2168 wrote to memory of 2704	2168	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	32
PID 2168 wrote to memory of 2704	2168	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	32
PID 2168 wrote to memory of 2704	2168	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	32
PID 2704 wrote to memory of 2668	2704	Clienty.exe	33
PID 2704 wrote to memory of 2668	2704	Clienty.exe	33
PID 2704 wrote to memory of 2668	2704	Clienty.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\4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe
"C:\Users\Admin\AppData\Local\Temp\4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2168
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Clienty.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2748
- C:\Users\Admin\AppData\Roaming\SubDir\Clienty.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Clienty.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2704
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Clienty.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2668

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.1MB

MD5
641cb02c429feb106094750765d0d6af

SHA1
db5be32e7ef7c5e93b7ef4f06bd6854f3a393cbd

SHA256
4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9

SHA512
8c4baa95d860c22e0ede96da48136db417f61ec6b19fccb847d0317f775e77d1e299f80e2f19230055fabf9e91ec8dbb2d90b055ddeb75b4c714c971afbf37b9

Download Submit
memory/2168-0-0x000007FEF5433000-0x000007FEF5434000-memory.dmp

Filesize
4KB

Download
memory/2168-1-0x0000000000850000-0x0000000000B74000-memory.dmp

Filesize
3.1MB

Download
memory/2168-2-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2168-8-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2704-10-0x0000000001350000-0x0000000001674000-memory.dmp

Filesize
3.1MB

Download
memory/2704-9-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2704-11-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2704-12-0x000007FEF5430000-0x000007FEF5E1C000-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