quasar | ccb74c64a45f838a6e7403d976d9b2d82afe40d96dc08952e6a374d8af3f09dd

General

Target

Client-built.exe
Size

3.1MB
MD5

7dbac71bcc7920b66e8c4fc04fbc30dd
SHA1

c746b4358c2a15765a010c1890979239f152d6f7
SHA256

ccb74c64a45f838a6e7403d976d9b2d82afe40d96dc08952e6a374d8af3f09dd
SHA512

56ffa2c92d97ef6b247db44225f659d8894f0c4c1134a8376346eb8f0a36bbb3331803752b8e24ada28dc554ef14d2098627ae751152b9eba956bb5e4d7c0c24
SSDEEP

49152:bvylL26AaNeWgPhlmVqvMQ7XSKB4RJ6kbR3LoGdXdTHHB72eh2NT:bvqL26AaNeWgPhlmVqkQ7XSKB4RJ6uH

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

hojex31104-23437.portmap.host:23437

Mutex

de505f8f-b6d9-44cb-b9ce-7e2f491eb29e

Attributes

encryption_key
D9C52C486698B9297B9AC8B87A65EA67135BE386
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/2644-1-0x0000000000380000-0x00000000006A4000-memory.dmp	family_quasar
behavioral1/files/0x00070000000191f3-5.dat	family_quasar
behavioral1/memory/1060-7-0x0000000000D20000-0x0000000001044000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1060	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
2460	schtasks.exe
2756	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2644	Client-built.exe
Token: SeDebugPrivilege	1060	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1060	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1060	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1060	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2644 wrote to memory of 2460	2644	Client-built.exe	31
PID 2644 wrote to memory of 2460	2644	Client-built.exe	31
PID 2644 wrote to memory of 2460	2644	Client-built.exe	31
PID 2644 wrote to memory of 1060	2644	Client-built.exe	33
PID 2644 wrote to memory of 1060	2644	Client-built.exe	33
PID 2644 wrote to memory of 1060	2644	Client-built.exe	33
PID 1060 wrote to memory of 2756	1060	Client.exe	34
PID 1060 wrote to memory of 2756	1060	Client.exe	34
PID 1060 wrote to memory of 2756	1060	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:2644
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2460
- 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:1060
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2756

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
7dbac71bcc7920b66e8c4fc04fbc30dd

SHA1
c746b4358c2a15765a010c1890979239f152d6f7

SHA256
ccb74c64a45f838a6e7403d976d9b2d82afe40d96dc08952e6a374d8af3f09dd

SHA512
56ffa2c92d97ef6b247db44225f659d8894f0c4c1134a8376346eb8f0a36bbb3331803752b8e24ada28dc554ef14d2098627ae751152b9eba956bb5e4d7c0c24

Download Submit
memory/1060-7-0x0000000000D20000-0x0000000001044000-memory.dmp

Filesize
3.1MB

Download
memory/1060-9-0x000007FEF5B00000-0x000007FEF64EC000-memory.dmp

Filesize
9.9MB

Download
memory/1060-10-0x000007FEF5B00000-0x000007FEF64EC000-memory.dmp

Filesize
9.9MB

Download
memory/1060-11-0x000007FEF5B00000-0x000007FEF64EC000-memory.dmp

Filesize
9.9MB

Download
memory/2644-0-0x000007FEF5B03000-0x000007FEF5B04000-memory.dmp

Filesize
4KB

Download
memory/2644-1-0x0000000000380000-0x00000000006A4000-memory.dmp

Filesize
3.1MB

Download
memory/2644-2-0x000007FEF5B00000-0x000007FEF64EC000-memory.dmp

Filesize
9.9MB

Download
memory/2644-8-0x000007FEF5B00000-0x000007FEF64EC000-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