quasar | 0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea

General

Target

0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea.exe
Size

3.1MB
MD5

cff3e677b6383632eff6d1b52cd6d277
SHA1

0936fb4aa7e39f2b56bc1b4c9364bb95e8f0c2a8
SHA256

0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea
SHA512

ddc33da48cf00e6ee4a57a07a98630082082f5cf76b9c1f844b17ff7f8328f0986a0d95f458947c6ca141a657991b31c608d9b3a9bdc83428ee53e55a34c2e61
SSDEEP

49152:6vht62XlaSFNWPjljiFa2RoUYIz0HxNESEqk/iGLoGd1THHB72eh2NT:6vL62XlaSFNWPjljiFXRoUYI4HxlI

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

73.62.14.5:4782

Mutex

3aaa11be-d135-4877-a61e-c409c29a7a60

Attributes

encryption_key
BC9162791FD860195CF75664AE64885B64D5B5CE
install_name
Client1.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/868-1-0x00000000002F0000-0x0000000000614000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b6d-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4808	Client1.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
4156	schtasks.exe
4256	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	868	0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea.exe
Token: SeDebugPrivilege	4808	Client1.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4808	Client1.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4808	Client1.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4808	Client1.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 868 wrote to memory of 4156	868	0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea.exe	82
PID 868 wrote to memory of 4156	868	0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea.exe	82
PID 868 wrote to memory of 4808	868	0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea.exe	84
PID 868 wrote to memory of 4808	868	0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea.exe	84
PID 4808 wrote to memory of 4256	4808	Client1.exe	85
PID 4808 wrote to memory of 4256	4808	Client1.exe	85

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\0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea.exe
"C:\Users\Admin\AppData\Local\Temp\0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:868
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4156
- C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client1.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:4808
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4256

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\Client1.exe

Filesize
3.1MB

MD5
cff3e677b6383632eff6d1b52cd6d277

SHA1
0936fb4aa7e39f2b56bc1b4c9364bb95e8f0c2a8

SHA256
0d57b81c8c42d3450782af358d0938d813abc28ec18b3ad6c81bd680a3efbbea

SHA512
ddc33da48cf00e6ee4a57a07a98630082082f5cf76b9c1f844b17ff7f8328f0986a0d95f458947c6ca141a657991b31c608d9b3a9bdc83428ee53e55a34c2e61

Download Submit
memory/868-0-0x00007FF916683000-0x00007FF916685000-memory.dmp

Filesize
8KB

Download
memory/868-1-0x00000000002F0000-0x0000000000614000-memory.dmp

Filesize
3.1MB

Download
memory/868-2-0x00007FF916680000-0x00007FF917141000-memory.dmp

Filesize
10.8MB

Download
memory/868-10-0x00007FF916680000-0x00007FF917141000-memory.dmp

Filesize
10.8MB

Download
memory/4808-9-0x00007FF916680000-0x00007FF917141000-memory.dmp

Filesize
10.8MB

Download
memory/4808-11-0x00007FF916680000-0x00007FF917141000-memory.dmp

Filesize
10.8MB

Download
memory/4808-12-0x000000001C9F0000-0x000000001CA40000-memory.dmp

Filesize
320KB

Download
memory/4808-13-0x000000001CB00000-0x000000001CBB2000-memory.dmp

Filesize
712KB

Download
memory/4808-14-0x00007FF916680000-0x00007FF917141000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads