quasar | 7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1

General

Target

7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe
Size

3.1MB
MD5

11563580013b8994395ff739dc37ed4a
SHA1

c527a22166dc153687ca33a8d964687459a6b669
SHA256

7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1
SHA512

4047470a756067ca4a4a038c080039945f37220fba7554ecad5d4912d4ea8611bd5efa5f72bbc7084ecfdbee3d63e8a163b675639572e2b9f21253f4c6e93e59
SSDEEP

49152:6vRt62XlaSFNWPjljiFa2RoUYIfu83oGNZZpTHHB72eh2NT:6vb62XlaSFNWPjljiFXRoUYIfuC

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.70:4782

Mutex

4cacefbd-58c1-418c-9da0-e646e1e6fc72

Attributes

encryption_key
772212B3F3C08D6945CE72024D790AD46DD8341D
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
defender
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/4944-1-0x0000000000300000-0x0000000000624000-memory.dmp	family_quasar
behavioral2/files/0x0009000000023c82-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3008	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	C:\Windows\system32\SubDir\Client.exe	7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe
File opened for modification	C:\Windows\system32\SubDir	7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	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
1124	schtasks.exe
2224	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4944	7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe
Token: SeDebugPrivilege	3008	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3008	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3008	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3008	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4944 wrote to memory of 1124	4944	7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe	85
PID 4944 wrote to memory of 1124	4944	7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe	85
PID 4944 wrote to memory of 3008	4944	7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe	87
PID 4944 wrote to memory of 3008	4944	7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe	87
PID 3008 wrote to memory of 2224	3008	Client.exe	88
PID 3008 wrote to memory of 2224	3008	Client.exe	88

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\7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe
"C:\Users\Admin\AppData\Local\Temp\7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4944
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "defender" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1124
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3008
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "defender" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2224

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
11563580013b8994395ff739dc37ed4a

SHA1
c527a22166dc153687ca33a8d964687459a6b669

SHA256
7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1

SHA512
4047470a756067ca4a4a038c080039945f37220fba7554ecad5d4912d4ea8611bd5efa5f72bbc7084ecfdbee3d63e8a163b675639572e2b9f21253f4c6e93e59

Download Submit
memory/3008-10-0x00007FF8BE390000-0x00007FF8BEE51000-memory.dmp

Filesize
10.8MB

Download
memory/3008-11-0x00007FF8BE390000-0x00007FF8BEE51000-memory.dmp

Filesize
10.8MB

Download
memory/3008-12-0x000000001BD10000-0x000000001BD60000-memory.dmp

Filesize
320KB

Download
memory/3008-13-0x000000001BE20000-0x000000001BED2000-memory.dmp

Filesize
712KB

Download
memory/3008-14-0x00007FF8BE390000-0x00007FF8BEE51000-memory.dmp

Filesize
10.8MB

Download
memory/4944-0-0x00007FF8BE393000-0x00007FF8BE395000-memory.dmp

Filesize
8KB

Download
memory/4944-1-0x0000000000300000-0x0000000000624000-memory.dmp

Filesize
3.1MB

Download
memory/4944-2-0x00007FF8BE390000-0x00007FF8BEE51000-memory.dmp

Filesize
10.8MB

Download
memory/4944-9-0x00007FF8BE390000-0x00007FF8BEE51000-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