quasar | 317b2e1eb9a1d427e165f38f2a44bd90329b729de3f7a2d19c511e023eab73a8

Analysis

max time kernel
141s
max time network
103s
platform
windows10-2004_x64
resource
win10v2004-20240802-uk
resource tags

arch:x64arch:x86image:win10v2004-20240802-uklocale:uk-uaos:windows10-2004-x64systemwindows
submitted
17/08/2024, 01:59

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General

Target
Client-built.exe
Size 3.1MB
Sample240817-cescrsthkk
SHA256 317b2e1eb9a1d427e165f38f2a44bd90329b729de3f7a2d19c511e023eab73a8
MD5 771320cba78821e9c290263827e4d32a
SHA1 9a39d6397eaf5e44a51d99a246a313decb113907
SHA512 d14b207cfacdbf3bc1b2516ed677e83ace171258995f4a85dc0f79aecd296126d76fa02c4c28fc9983bece819c528f0e6ac43225cb635c1df37070a3da8adec1
SSDEEP 49152:e+w9o5EqFBnmhVXIlQVL/I2jCQTHHB72eh2NTQ:e+vEqFBnmhVXIluD
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar skids discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

SKIDS

147.185.221.22:6712

Mutex

545a5892-0ce9-4925-83a7-479d8b964612

Attributes

encryption_key
9E968F05BD874BA1BE086FD1774A027473823F49
install_name
Windows Host Process.exe
log_directory
Windows-Logs
reconnect_delay
3000
startup_key
Windows Host Process
subdirectory
Windows

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/3496-1-0x0000000000BD0000-0x0000000000EFC000-memory.dmp	family_quasar
behavioral2/files/0x00070000000234a6-6.dat	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Control Panel\International\Geo\Nation	Windows Host Process.exe

Executes dropped EXE 1 IoCs

pid	Process
2044	Windows Host Process.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\Windows	Client-built.exe
File opened for modification	C:\Windows\system32\Windows\Windows Host Process.exe	Windows Host Process.exe
File opened for modification	C:\Windows\system32\Windows	Windows Host Process.exe
File created	C:\Windows\system32\Windows\Windows Host Process.exe	Client-built.exe
File opened for modification	C:\Windows\system32\Windows\Windows Host Process.exe	Client-built.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4116	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4116	PING.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
4852	schtasks.exe
2972	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3496	Client-built.exe
Token: SeDebugPrivilege	2044	Windows Host Process.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
2044	Windows Host Process.exe
2044	Windows Host Process.exe
2044	Windows Host Process.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
2044	Windows Host Process.exe
2044	Windows Host Process.exe
2044	Windows Host Process.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2044	Windows Host Process.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3496 wrote to memory of 4852	3496	Client-built.exe	87
PID 3496 wrote to memory of 4852	3496	Client-built.exe	87
PID 3496 wrote to memory of 2044	3496	Client-built.exe	89
PID 3496 wrote to memory of 2044	3496	Client-built.exe	89
PID 2044 wrote to memory of 2972	2044	Windows Host Process.exe	90
PID 2044 wrote to memory of 2972	2044	Windows Host Process.exe	90
PID 2044 wrote to memory of 2992	2044	Windows Host Process.exe	102
PID 2044 wrote to memory of 2992	2044	Windows Host Process.exe	102
PID 2044 wrote to memory of 3108	2044	Windows Host Process.exe	104
PID 2044 wrote to memory of 3108	2044	Windows Host Process.exe	104
PID 3108 wrote to memory of 1332	3108	cmd.exe	106
PID 3108 wrote to memory of 1332	3108	cmd.exe	106
PID 3108 wrote to memory of 4116	3108	cmd.exe	107
PID 3108 wrote to memory of 4116	3108	cmd.exe	107

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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.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 "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4852
- C:\Windows\system32\Windows\Windows Host Process.exe
  "C:\Windows\system32\Windows\Windows Host Process.exe"
  2⤵
  - Checks computer location settings
  - 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:2044
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2972
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /delete /tn "Windows Host Process" /f
    3⤵
    PID:2992
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\W6aaRfv43nYu.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3108
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:1332
  - - C:\Windows\system32\PING.EXE
      ping -n 10 localhost
      4⤵
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4116

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

W6aaRfv43nYu.bat

Path C:\Users\Admin\AppData\Local\Temp\W6aaRfv43nYu.bat
Size 215B
SHA256 bef4e2b85a2a56b17763fe242feb570b0773b8531bc1ea45575a37e8e0ece54e
MD5 c6c9f1d1e978630ae7aad474559a2971
SHA1 f6b2d25a27610a490c4fd18bcc2d23d5dc033eb1
SHA512 35454850f0f658716e8cd7df2feab26c722079644e384e207127c93648ba53166dfdc008088b1cd6ad25ba238b8e81ec677dae7a8c55e7471316678c3f10cd3f
MD5 SHA1 SHA512

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Windows Host Process.exe

Path C:\Windows\System32\Windows\Windows Host Process.exe
Size 3.1MB
SHA256 317b2e1eb9a1d427e165f38f2a44bd90329b729de3f7a2d19c511e023eab73a8
MD5 771320cba78821e9c290263827e4d32a
SHA1 9a39d6397eaf5e44a51d99a246a313decb113907
SHA512 d14b207cfacdbf3bc1b2516ed677e83ace171258995f4a85dc0f79aecd296126d76fa02c4c28fc9983bece819c528f0e6ac43225cb635c1df37070a3da8adec1
SSDEEP 49152:e+w9o5EqFBnmhVXIlQVL/I2jCQTHHB72eh2NTQ:e+vEqFBnmhVXIluD
MD5 SHA1 SHA512 SSDEEP

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memory/2044-11-0x00007FFFF3770000-0x00007FFFF4231000-memory.dmp

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memory/2044-9-0x00007FFFF3770000-0x00007FFFF4231000-memory.dmp

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memory/2044-12-0x000000001C3E0000-0x000000001C430000-memory.dmp

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memory/2044-13-0x000000001C4F0000-0x000000001C5A2000-memory.dmp

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memory/2044-16-0x000000001C470000-0x000000001C482000-memory.dmp

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memory/2044-17-0x000000001CFF0000-0x000000001D02C000-memory.dmp

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memory/2044-18-0x00007FFFF3770000-0x00007FFFF4231000-memory.dmp

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memory/2044-23-0x00007FFFF3770000-0x00007FFFF4231000-memory.dmp

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memory/3496-2-0x00007FFFF3770000-0x00007FFFF4231000-memory.dmp

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memory/3496-10-0x00007FFFF3770000-0x00007FFFF4231000-memory.dmp

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memory/3496-0-0x00007FFFF3773000-0x00007FFFF3775000-memory.dmp

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memory/3496-1-0x0000000000BD0000-0x0000000000EFC000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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