quasar | 54f96306329acf69543eafbc220bb617151cf4f6572d05a1d99aa2633134b29f

General

Target

Client-built.exe
Size

3.1MB
MD5

4c11f56b9a516468535cd9dfb4625554
SHA1

c85f8a363d0bc4071c82648736d04502a0f77b6e
SHA256

54f96306329acf69543eafbc220bb617151cf4f6572d05a1d99aa2633134b29f
SHA512

b525267b0de611e119c141962f9b8a2e054b3f5afa15140d098ca278e468658aac649c19b802076461fc283e7b7a826b146b3a2319e2af635df6eb820fd81e1d
SSDEEP

49152:tmCk6UTYfYnGJCvFt8lJ6QgeC2eH4THHB72eh2NT:tmsUTyYnGJCvFt8lJ6Qg5

Score

10^/10

quasar skids spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

SKIDS

C2

147.185.221.22:6712

Mutex

4464eb7a-fcd4-46b0-a1b1-9f00f87d96f8

Attributes

encryption_key
9E968F05BD874BA1BE086FD1774A027473823F49
install_name
Windows Host Process.exe
log_directory
WindowsLogs
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/4520-1-0x0000000000090000-0x00000000003BC000-memory.dmp	family_quasar
behavioral2/files/0x00070000000233d0-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1392	Windows Host Process.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
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
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

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000_Classes\Local Settings\MuiCache	StartMenuExperienceHost.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
4500	schtasks.exe
864	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4520	Client-built.exe
Token: SeDebugPrivilege	1392	Windows Host Process.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
1392	Windows Host Process.exe
1392	Windows Host Process.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
1392	Windows Host Process.exe
1392	Windows Host Process.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1392	Windows Host Process.exe
4936	StartMenuExperienceHost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4520 wrote to memory of 4500	4520	Client-built.exe	89
PID 4520 wrote to memory of 4500	4520	Client-built.exe	89
PID 4520 wrote to memory of 1392	4520	Client-built.exe	91
PID 4520 wrote to memory of 1392	4520	Client-built.exe	91
PID 1392 wrote to memory of 864	1392	Windows Host Process.exe	92
PID 1392 wrote to memory of 864	1392	Windows Host Process.exe	92

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:4520
- 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:4500
- C:\Windows\system32\Windows\Windows Host Process.exe
  "C:\Windows\system32\Windows\Windows Host Process.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:1392
- - 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:864

C:\Windows\system32\dwm.exe
"dwm.exe"
1⤵
PID:4272

C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
"C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4936

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\Windows\Windows Host Process.exe

Filesize
3.1MB

MD5
4c11f56b9a516468535cd9dfb4625554

SHA1
c85f8a363d0bc4071c82648736d04502a0f77b6e

SHA256
54f96306329acf69543eafbc220bb617151cf4f6572d05a1d99aa2633134b29f

SHA512
b525267b0de611e119c141962f9b8a2e054b3f5afa15140d098ca278e468658aac649c19b802076461fc283e7b7a826b146b3a2319e2af635df6eb820fd81e1d

Download Submit
memory/1392-11-0x00007FFE6E440000-0x00007FFE6EF01000-memory.dmp

Filesize
10.8MB

Download
memory/1392-10-0x00007FFE6E440000-0x00007FFE6EF01000-memory.dmp

Filesize
10.8MB

Download
memory/1392-12-0x000000001C700000-0x000000001C750000-memory.dmp

Filesize
320KB

Download
memory/1392-13-0x000000001C810000-0x000000001C8C2000-memory.dmp

Filesize
712KB

Download
memory/1392-16-0x000000001C790000-0x000000001C7A2000-memory.dmp

Filesize
72KB

Download
memory/1392-17-0x000000001D010000-0x000000001D04C000-memory.dmp

Filesize
240KB

Download
memory/1392-18-0x00007FFE6E440000-0x00007FFE6EF01000-memory.dmp

Filesize
10.8MB

Download
memory/1392-19-0x00007FFE6E440000-0x00007FFE6EF01000-memory.dmp

Filesize
10.8MB

Download
memory/4520-2-0x00007FFE6E440000-0x00007FFE6EF01000-memory.dmp

Filesize
10.8MB

Download
memory/4520-1-0x0000000000090000-0x00000000003BC000-memory.dmp

Filesize
3.2MB

Download
memory/4520-9-0x00007FFE6E440000-0x00007FFE6EF01000-memory.dmp

Filesize
10.8MB

Download
memory/4520-0-0x00007FFE6E443000-0x00007FFE6E445000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads