quasar | 098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6

General

Target

098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe
Size

3.4MB
MD5

8b2e0fa65ef1b87ffcc3ca43ddab5eb8
SHA1

89c584fa347a1e9b9caa3205f37b67d4bdf47fcc
SHA256

098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6
SHA512

3d5eec18d870a104389e0e628e01ae3fdd372e65a3b7a0eb33fbc99965e3b6cd8e51cccf208041e0f6a3be55764286bf855e10c0792982cf458a8633ff29cbce
SSDEEP

49152:TvEuf2NUaNmwzPWlvdaKM7ZxTwR873dar7joGdyTHHB72eh2NT:Tvzf2NUaNmwzPWlvdaB7ZxTwS3S

Score

10^/10

quasar winlogson spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

winlogson

C2

192.168.178.69:4782

coluich1220.duckdns.org:4782

Mutex

a409f48d-fe2a-4207-b2c2-585b18fb47b3

Attributes

encryption_key
4A886EE72F3932EB3311C152EDED110A81EF6553
install_name
winlogson.exe
log_directory
Logs
reconnect_delay
3000
startup_key
winlogson
subdirectory
winlogson

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/3496-1-0x0000000000800000-0x0000000000B60000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b97-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3616	winlogson.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\winlogson\winlogson.exe	098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe
File opened for modification	C:\Windows\system32\winlogson\winlogson.exe	098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe
File opened for modification	C:\Windows\system32\winlogson	098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe
File opened for modification	C:\Windows\system32\winlogson\winlogson.exe	winlogson.exe
File opened for modification	C:\Windows\system32\winlogson	winlogson.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
3968	schtasks.exe
2852	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3496	098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe
Token: SeDebugPrivilege	3616	winlogson.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3616	winlogson.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3496 wrote to memory of 3968	3496	098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe	82
PID 3496 wrote to memory of 3968	3496	098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe	82
PID 3496 wrote to memory of 3616	3496	098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe	84
PID 3496 wrote to memory of 3616	3496	098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe	84
PID 3616 wrote to memory of 2852	3616	winlogson.exe	85
PID 3616 wrote to memory of 2852	3616	winlogson.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\098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe
"C:\Users\Admin\AppData\Local\Temp\098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3496
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "winlogson" /sc ONLOGON /tr "C:\Windows\system32\winlogson\winlogson.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3968
- C:\Windows\system32\winlogson\winlogson.exe
  "C:\Windows\system32\winlogson\winlogson.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3616
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "winlogson" /sc ONLOGON /tr "C:\Windows\system32\winlogson\winlogson.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2852

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:\Windows\System32\winlogson\winlogson.exe

Filesize
3.4MB

MD5
8b2e0fa65ef1b87ffcc3ca43ddab5eb8

SHA1
89c584fa347a1e9b9caa3205f37b67d4bdf47fcc

SHA256
098f75d091ae6473dce8b06216ab154737468869375e35e5949e39904dbe71e6

SHA512
3d5eec18d870a104389e0e628e01ae3fdd372e65a3b7a0eb33fbc99965e3b6cd8e51cccf208041e0f6a3be55764286bf855e10c0792982cf458a8633ff29cbce

Download Submit
memory/3496-0-0x00007FFF15563000-0x00007FFF15565000-memory.dmp

Filesize
8KB

Download
memory/3496-1-0x0000000000800000-0x0000000000B60000-memory.dmp

Filesize
3.4MB

Download
memory/3496-2-0x00007FFF15560000-0x00007FFF16021000-memory.dmp

Filesize
10.8MB

Download
memory/3496-10-0x00007FFF15560000-0x00007FFF16021000-memory.dmp

Filesize
10.8MB

Download
memory/3616-9-0x00007FFF15560000-0x00007FFF16021000-memory.dmp

Filesize
10.8MB

Download
memory/3616-11-0x00007FFF15560000-0x00007FFF16021000-memory.dmp

Filesize
10.8MB

Download
memory/3616-12-0x000000001B820000-0x000000001B870000-memory.dmp

Filesize
320KB

Download
memory/3616-13-0x000000001D930000-0x000000001D9E2000-memory.dmp

Filesize
712KB

Download
memory/3616-14-0x00007FFF15560000-0x00007FFF16021000-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