quasar | 3c929d7c2dfe5638f93422aa26f6b6ef06624d0f8daa49887db9aac351d7b9d4

General

Target

Cryptor/Client-built.exe
Size

3.1MB
MD5

ffde80003bb39e45f92460a84b343771
SHA1

1ada86e287115526fc12d74865de3ca0c59c8c08
SHA256

e057b678ff3bca92b8672af195249608bcb56cfd01c1980d14b7c3e4d6952c8b
SHA512

4ae9adb21f511b1d114d5258d24d5b138a387149c593ed0743ad644ddb9461a248919ed305dbaae6b9beed9ed4525f8ad23a653c4b6507e7a021ea05a35961b4
SSDEEP

49152:uvRt62XlaSFNWPjljiFa2RoUYI9yL37ar1LoGdZ+47UTHHB72eh2NT:uvb62XlaSFNWPjljiFXRoUYIA3O

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

127.0.0.1:4782

Mutex

b8be2b57-3322-4df8-967c-65aedf2d425d

Attributes

encryption_key
5871F8D84AF9E4D8F5ABACF2A5DD66E256B5A672
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/1204-1-0x0000000000920000-0x0000000000C44000-memory.dmp	family_quasar
behavioral1/files/0x0007000000016cab-5.dat	family_quasar
behavioral1/memory/2700-8-0x0000000000D40000-0x0000000001064000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2700	Client.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client-built.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
2800	schtasks.exe
2776	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1204	Client-built.exe
Token: SeDebugPrivilege	2700	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2700	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2700	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2700	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1204 wrote to memory of 2800	1204	Client-built.exe	30
PID 1204 wrote to memory of 2800	1204	Client-built.exe	30
PID 1204 wrote to memory of 2800	1204	Client-built.exe	30
PID 1204 wrote to memory of 2700	1204	Client-built.exe	32
PID 1204 wrote to memory of 2700	1204	Client-built.exe	32
PID 1204 wrote to memory of 2700	1204	Client-built.exe	32
PID 2700 wrote to memory of 2776	2700	Client.exe	33
PID 2700 wrote to memory of 2776	2700	Client.exe	33
PID 2700 wrote to memory of 2776	2700	Client.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\Cryptor\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Cryptor\Client-built.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1204
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2800
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\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:2700
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2776

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:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
ffde80003bb39e45f92460a84b343771

SHA1
1ada86e287115526fc12d74865de3ca0c59c8c08

SHA256
e057b678ff3bca92b8672af195249608bcb56cfd01c1980d14b7c3e4d6952c8b

SHA512
4ae9adb21f511b1d114d5258d24d5b138a387149c593ed0743ad644ddb9461a248919ed305dbaae6b9beed9ed4525f8ad23a653c4b6507e7a021ea05a35961b4

Download Submit
memory/1204-0-0x000007FEF5DF3000-0x000007FEF5DF4000-memory.dmp

Filesize
4KB

Download
memory/1204-1-0x0000000000920000-0x0000000000C44000-memory.dmp

Filesize
3.1MB

Download
memory/1204-2-0x000007FEF5DF0000-0x000007FEF67DC000-memory.dmp

Filesize
9.9MB

Download
memory/1204-7-0x000007FEF5DF0000-0x000007FEF67DC000-memory.dmp

Filesize
9.9MB

Download
memory/2700-10-0x000007FEF5DF0000-0x000007FEF67DC000-memory.dmp

Filesize
9.9MB

Download
memory/2700-9-0x000007FEF5DF0000-0x000007FEF67DC000-memory.dmp

Filesize
9.9MB

Download
memory/2700-8-0x0000000000D40000-0x0000000001064000-memory.dmp

Filesize
3.1MB

Download
memory/2700-11-0x000007FEF5DF0000-0x000007FEF67DC000-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