quasar | f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2e

General

Target

f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe
Size

3.1MB
MD5

72194b4da4b58d78e3c766af20a0b5a0
SHA1

c7e14ffaa30aa186babbfab5de102efd4a676a21
SHA256

f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2e
SHA512

6f70cd60703420cafd1fa8d3197dd7ee382d94f991b141ae30042ba70afc15a97fb522797625074449c1648f2d5532cc84023c088e5fd17b53a8059769486d71
SSDEEP

49152:rvyI22SsaNYfdPBldt698dBcjH2QRJ6WbR3LoGdgcTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjH2QRJ6QQ

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

50.114.115.135:4782

Mutex

1e0c60c5-a4af-4c26-a7f1-5ee890a8321a

Attributes

encryption_key
26CBB40F2457EA2E776A5BB10B783B74E5FD47D3
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/1732-1-0x0000000000080000-0x00000000003A4000-memory.dmp	family_quasar
behavioral1/files/0x000700000001924c-6.dat	family_quasar
behavioral1/memory/2496-9-0x0000000000900000-0x0000000000C24000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2496	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
1692	schtasks.exe
2468	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1732	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe
Token: SeDebugPrivilege	2496	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2496	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1732 wrote to memory of 1692	1732	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	30
PID 1732 wrote to memory of 1692	1732	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	30
PID 1732 wrote to memory of 1692	1732	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	30
PID 1732 wrote to memory of 2496	1732	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	32
PID 1732 wrote to memory of 2496	1732	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	32
PID 1732 wrote to memory of 2496	1732	f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe	32
PID 2496 wrote to memory of 2468	2496	Client.exe	33
PID 2496 wrote to memory of 2468	2496	Client.exe	33
PID 2496 wrote to memory of 2468	2496	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\f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe
"C:\Users\Admin\AppData\Local\Temp\f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2eN.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1732
- 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:1692
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2496
- - 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:2468

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

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
72194b4da4b58d78e3c766af20a0b5a0

SHA1
c7e14ffaa30aa186babbfab5de102efd4a676a21

SHA256
f57957e46a34721d4e1ac24e7a688ef5ac468e670da8aeed3df5588cd2ff9b2e

SHA512
6f70cd60703420cafd1fa8d3197dd7ee382d94f991b141ae30042ba70afc15a97fb522797625074449c1648f2d5532cc84023c088e5fd17b53a8059769486d71

Download Submit
memory/1732-0-0x000007FEF5263000-0x000007FEF5264000-memory.dmp

Filesize
4KB

Download
memory/1732-1-0x0000000000080000-0x00000000003A4000-memory.dmp

Filesize
3.1MB

Download
memory/1732-2-0x000007FEF5260000-0x000007FEF5C4C000-memory.dmp

Filesize
9.9MB

Download
memory/1732-8-0x000007FEF5260000-0x000007FEF5C4C000-memory.dmp

Filesize
9.9MB

Download
memory/2496-9-0x0000000000900000-0x0000000000C24000-memory.dmp

Filesize
3.1MB

Download
memory/2496-10-0x000007FEF5260000-0x000007FEF5C4C000-memory.dmp

Filesize
9.9MB

Download
memory/2496-11-0x000007FEF5260000-0x000007FEF5C4C000-memory.dmp

Filesize
9.9MB

Download
memory/2496-12-0x000007FEF5260000-0x000007FEF5C4C000-memory.dmp

Filesize
9.9MB

Download
memory/2496-13-0x000007FEF5260000-0x000007FEF5C4C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads