quasar | 5900b0e5f972927db833977bee140aa7f10863eeb40c8f7e4742c6c8bd3a3063

General

Target

Client-built.exe
Size

3.1MB
MD5

f4b0be81680b72bae9c31f3225149616
SHA1

12dca5c6e3c2e7a91ba8e30ec4e56a888d3bfa8e
SHA256

5900b0e5f972927db833977bee140aa7f10863eeb40c8f7e4742c6c8bd3a3063
SHA512

1aeb4459bb0d558194033c451f631cfd75c9941a16c33aace8808816e36ddc3322a5e17152629594014d8e9f50b6335edc673dcbc67f3a3a32d272d233107d17
SSDEEP

49152:3vflL26AaNeWgPhlmVqvMQ7XSKwYEb6LxpeoGddLTHHB72eh2NT:3vtL26AaNeWgPhlmVqkQ7XSKwYEbPN

Score

10^/10

quasar client spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Client

C2

192.168.2.106:9845

Mutex

886f65bf-be67-4863-9244-e6f9bebe60cf

Attributes

encryption_key
4723FE2DBDCD0127EBB880CBCA3A5D063F882349
install_name
WindowsUpdateConsole.exe
log_directory
Logs
reconnect_delay
3000
startup_key
WindowsSystemRun
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/3548-1-0x0000000000C40000-0x0000000000F64000-memory.dmp	family_quasar
behavioral1/files/0x001e00000002aa82-6.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

WindowsUpdateConsole.exe

pid	Process
4048	WindowsUpdateConsole.exe

Drops file in System32 directory 5 IoCs

Processes:

Client-built.exeWindowsUpdateConsole.exe

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

Processes:

schtasks.exeschtasks.exe

pid	Process
3144	schtasks.exe
3364	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeWindowsUpdateConsole.exe

description	pid	Process
Token: SeDebugPrivilege	3548	Client-built.exe
Token: SeDebugPrivilege	4048	WindowsUpdateConsole.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

WindowsUpdateConsole.exe

pid	Process
4048	WindowsUpdateConsole.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

WindowsUpdateConsole.exe

pid	Process
4048	WindowsUpdateConsole.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeWindowsUpdateConsole.exe

description	pid	Process	procid_target
PID 3548 wrote to memory of 3144	3548	Client-built.exe	80
PID 3548 wrote to memory of 3144	3548	Client-built.exe	80
PID 3548 wrote to memory of 4048	3548	Client-built.exe	82
PID 3548 wrote to memory of 4048	3548	Client-built.exe	82
PID 4048 wrote to memory of 3364	4048	WindowsUpdateConsole.exe	84
PID 4048 wrote to memory of 3364	4048	WindowsUpdateConsole.exe	84

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:3548
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "WindowsSystemRun" /sc ONLOGON /tr "C:\Windows\system32\SubDir\WindowsUpdateConsole.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3144
- C:\Windows\system32\SubDir\WindowsUpdateConsole.exe
  "C:\Windows\system32\SubDir\WindowsUpdateConsole.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 WriteProcessMemory
  PID:4048
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "WindowsSystemRun" /sc ONLOGON /tr "C:\Windows\system32\SubDir\WindowsUpdateConsole.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3364

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\WindowsUpdateConsole.exe

Filesize
3.1MB

MD5
f4b0be81680b72bae9c31f3225149616

SHA1
12dca5c6e3c2e7a91ba8e30ec4e56a888d3bfa8e

SHA256
5900b0e5f972927db833977bee140aa7f10863eeb40c8f7e4742c6c8bd3a3063

SHA512
1aeb4459bb0d558194033c451f631cfd75c9941a16c33aace8808816e36ddc3322a5e17152629594014d8e9f50b6335edc673dcbc67f3a3a32d272d233107d17

Download Submit
memory/3548-0-0x00007FF8E2193000-0x00007FF8E2195000-memory.dmp

Filesize
8KB

Download
memory/3548-1-0x0000000000C40000-0x0000000000F64000-memory.dmp

Filesize
3.1MB

Download
memory/3548-2-0x00007FF8E2190000-0x00007FF8E2C52000-memory.dmp

Filesize
10.8MB

Download
memory/3548-13-0x00007FF8E2190000-0x00007FF8E2C52000-memory.dmp

Filesize
10.8MB

Download
memory/4048-9-0x00007FF8E2190000-0x00007FF8E2C52000-memory.dmp

Filesize
10.8MB

Download
memory/4048-10-0x00007FF8E2190000-0x00007FF8E2C52000-memory.dmp

Filesize
10.8MB

Download
memory/4048-11-0x000000001C2A0000-0x000000001C2F0000-memory.dmp

Filesize
320KB

Download
memory/4048-12-0x000000001C3B0000-0x000000001C462000-memory.dmp

Filesize
712KB

Download
memory/4048-14-0x00007FF8E2190000-0x00007FF8E2C52000-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