quasar | bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570

General

Target

bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe
Size

3.4MB
MD5

73fb4fbe3f3202a618aa74935779e3ac
SHA1

73c9f409c2f10ac0af8cffd3969b6b93b07768b4
SHA256

bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570
SHA512

478f6a181b4f95a7d6f5c48f1a25fd88083eb18df759c89cc3227d70b12ca498447536b0bf77bc0a7c60bcd860c5f1ed2f837280bde7e41c0f078a51531b188e
SSDEEP

49152:3v7I22SsaNYfdPBldt698dBcjHuwAW1J3PoGdDTHHB72eh2NTi:3vE22SsaNYfdPBldt6+dBcjHuwAqL

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.15:4782

Mutex

400d2b6f-f5a4-4bb8-8ac1-572601b9847a

Attributes

encryption_key
28DB6A992E078CF6FE82A1042CC979D37C6466CE
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/3008-1-0x0000000000C30000-0x0000000000F96000-memory.dmp	family_quasar
behavioral1/files/0x0009000000015d41-7.dat	family_quasar
behavioral1/memory/2116-10-0x00000000013B0000-0x0000000001716000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2116	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
2080	schtasks.exe
1892	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3008	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe
Token: SeDebugPrivilege	2116	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2116	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2116	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2116	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3008 wrote to memory of 2080	3008	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	30
PID 3008 wrote to memory of 2080	3008	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	30
PID 3008 wrote to memory of 2080	3008	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	30
PID 3008 wrote to memory of 2116	3008	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	32
PID 3008 wrote to memory of 2116	3008	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	32
PID 3008 wrote to memory of 2116	3008	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	32
PID 2116 wrote to memory of 1892	2116	Client.exe	33
PID 2116 wrote to memory of 1892	2116	Client.exe	33
PID 2116 wrote to memory of 1892	2116	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\bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe
"C:\Users\Admin\AppData\Local\Temp\bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3008
- 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:2080
- 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:2116
- - 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:1892

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
3.4MB

MD5
73fb4fbe3f3202a618aa74935779e3ac

SHA1
73c9f409c2f10ac0af8cffd3969b6b93b07768b4

SHA256
bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570

SHA512
478f6a181b4f95a7d6f5c48f1a25fd88083eb18df759c89cc3227d70b12ca498447536b0bf77bc0a7c60bcd860c5f1ed2f837280bde7e41c0f078a51531b188e

Download Submit
memory/2116-10-0x00000000013B0000-0x0000000001716000-memory.dmp

Filesize
3.4MB

Download
memory/2116-9-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/2116-11-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/2116-12-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/3008-0-0x000007FEF67F3000-0x000007FEF67F4000-memory.dmp

Filesize
4KB

Download
memory/3008-1-0x0000000000C30000-0x0000000000F96000-memory.dmp

Filesize
3.4MB

Download
memory/3008-2-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/3008-8-0x000007FEF67F0000-0x000007FEF71DC000-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