quasar | 9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad

General

Target

installer.exe
Size

3.1MB
MD5

dbde842faf140037f07cad5bd09771e9
SHA1

64dbcaf7d1e664556b5fd82e0e8b8efeae38dea0
SHA256

9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad
SHA512

8a970a2ef3e0bcf378acce7a748289b8cdc68c5ff7b50d940dd4ce1f94c9790e9be6a440e1baf57e5fab8a6d767d4a1ddbe6b2244c23a95f91f553af32339885
SSDEEP

49152:hveI22SsaNYfdPBldt698dBcjHDCG1JELoGdXTHHB72eh2NT:hvT22SsaNYfdPBldt6+dBcjHDC3

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.68.104:4782

Mutex

93aae856-95a8-4f87-bb5a-e035e00ec571

Attributes

encryption_key
A9BD88FEF9A2EA52A07F5C37D168C315C868BC60
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Antimalware Core Service
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/3012-1-0x0000000000860000-0x0000000000B84000-memory.dmp	family_quasar
behavioral1/files/0x00070000000193c4-5.dat	family_quasar
behavioral1/memory/2852-8-0x00000000002F0000-0x0000000000614000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2852	Client.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
2800	schtasks.exe
2636	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3012	installer.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 3012 wrote to memory of 2800	3012	installer.exe	30
PID 3012 wrote to memory of 2800	3012	installer.exe	30
PID 3012 wrote to memory of 2800	3012	installer.exe	30
PID 3012 wrote to memory of 2852	3012	installer.exe	32
PID 3012 wrote to memory of 2852	3012	installer.exe	32
PID 3012 wrote to memory of 2852	3012	installer.exe	32
PID 2852 wrote to memory of 2636	2852	Client.exe	33
PID 2852 wrote to memory of 2636	2852	Client.exe	33
PID 2852 wrote to memory of 2636	2852	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\installer.exe
"C:\Users\Admin\AppData\Local\Temp\installer.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3012
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Antimalware Core Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2800
- 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 "Antimalware Core Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2636

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\Client.exe

Filesize
3.1MB

MD5
dbde842faf140037f07cad5bd09771e9

SHA1
64dbcaf7d1e664556b5fd82e0e8b8efeae38dea0

SHA256
9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad

SHA512
8a970a2ef3e0bcf378acce7a748289b8cdc68c5ff7b50d940dd4ce1f94c9790e9be6a440e1baf57e5fab8a6d767d4a1ddbe6b2244c23a95f91f553af32339885

Download Submit
memory/2852-8-0x00000000002F0000-0x0000000000614000-memory.dmp

Filesize
3.1MB

Download
memory/2852-10-0x000007FEF4EC0000-0x000007FEF58AC000-memory.dmp

Filesize
9.9MB

Download
memory/2852-9-0x000007FEF4EC0000-0x000007FEF58AC000-memory.dmp

Filesize
9.9MB

Download
memory/2852-11-0x000007FEF4EC0000-0x000007FEF58AC000-memory.dmp

Filesize
9.9MB

Download
memory/3012-0-0x000007FEF4EC3000-0x000007FEF4EC4000-memory.dmp

Filesize
4KB

Download
memory/3012-1-0x0000000000860000-0x0000000000B84000-memory.dmp

Filesize
3.1MB

Download
memory/3012-2-0x000007FEF4EC0000-0x000007FEF58AC000-memory.dmp

Filesize
9.9MB

Download
memory/3012-7-0x000007FEF4EC0000-0x000007FEF58AC000-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