quasar | 9828991298eb16c8df48b48dde0a056856f41c62ca4c694d86334cde1645e07c

General

Target

Client-built.exe
Size

3.1MB
MD5

32bac0be7a9c9bdd93b8b708f47f1313
SHA1

1f0d7dd2e310613336fa569d3651a394ddb305fe
SHA256

9828991298eb16c8df48b48dde0a056856f41c62ca4c694d86334cde1645e07c
SHA512

8d797936672817abeab907c15715cf38e57eed41399c26f2af8171631d53d16d2bd693568e1b6b5a16c251f7ac030d5826a4784a4a79030753be407e794c0fb6
SSDEEP

49152:djKqzUIZA0404kub/lFqkIFFIJHZ541JOOoGVJiTHHB72eh2NT:djlzUq3404kub/lFqkIFFIJHZ5u

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Name123forreal-31171.portmap.host:31171

Mutex

f9634259-eba6-40ac-8644-2c8e433257e9

Attributes

encryption_key
5FD1DA98B24B21C2214C328FD3F0A48F15BBCD2B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Window Defender Startup
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2032-1-0x0000000000140000-0x0000000000464000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b85-6.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

Processes:

Client.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
4252	Client.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

Processes:

PING.EXE

pid	Process
4080	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

Processes:

PING.EXE

pid	Process
4080	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

Processes:

schtasks.exeschtasks.exe

pid	Process
2316	schtasks.exe
2408	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	2032	Client-built.exe
Token: SeDebugPrivilege	4252	Client.exe

Suspicious use of FindShellTrayWindow 5 IoCs

Processes:

Client.exe

pid	Process
4252	Client.exe
4252	Client.exe
4252	Client.exe
4252	Client.exe
4252	Client.exe

Suspicious use of SendNotifyMessage 5 IoCs

Processes:

Client.exe

pid	Process
4252	Client.exe
4252	Client.exe
4252	Client.exe
4252	Client.exe
4252	Client.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

Client-built.exeClient.execmd.exe

description	pid	Process	procid_target
PID 2032 wrote to memory of 2316	2032	Client-built.exe	87
PID 2032 wrote to memory of 2316	2032	Client-built.exe	87
PID 2032 wrote to memory of 4252	2032	Client-built.exe	89
PID 2032 wrote to memory of 4252	2032	Client-built.exe	89
PID 4252 wrote to memory of 2408	4252	Client.exe	90
PID 4252 wrote to memory of 2408	4252	Client.exe	90
PID 4252 wrote to memory of 1816	4252	Client.exe	115
PID 4252 wrote to memory of 1816	4252	Client.exe	115
PID 4252 wrote to memory of 4900	4252	Client.exe	117
PID 4252 wrote to memory of 4900	4252	Client.exe	117
PID 4900 wrote to memory of 3956	4900	cmd.exe	119
PID 4900 wrote to memory of 3956	4900	cmd.exe	119
PID 4900 wrote to memory of 4080	4900	cmd.exe	120
PID 4900 wrote to memory of 4080	4900	cmd.exe	120

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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2032
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Window Defender Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2316
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:4252
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Window Defender Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2408
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /delete /tn "Window Defender Startup" /f
    3⤵
    PID:1816
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\GCcHiKozmKVj.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4900
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:3956
  - - C:\Windows\system32\PING.EXE
      ping -n 10 localhost
      4⤵
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4080

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

2

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\GCcHiKozmKVj.bat

Filesize
211B

MD5
491e24e283bfcb8cc54829abed8f5415

SHA1
547a8a62ed2751084858aaf534028f8e9e9af4b7

SHA256
4cf5605d7de81fc224cdccedc9def311578a4e7b93c07628e6a20eaa6aa49e74

SHA512
b017c9f97f89595dbc994df43440cb85a3cc1e92d96ddab53af357bf2481137dfbef321d3737cca660fe76f85fa58c302490da90e1f2bc5d49e8bef5c4df85d4

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
32bac0be7a9c9bdd93b8b708f47f1313

SHA1
1f0d7dd2e310613336fa569d3651a394ddb305fe

SHA256
9828991298eb16c8df48b48dde0a056856f41c62ca4c694d86334cde1645e07c

SHA512
8d797936672817abeab907c15715cf38e57eed41399c26f2af8171631d53d16d2bd693568e1b6b5a16c251f7ac030d5826a4784a4a79030753be407e794c0fb6

Download Submit
memory/2032-0-0x00007FFB5E6D3000-0x00007FFB5E6D5000-memory.dmp

Filesize
8KB

Download
memory/2032-1-0x0000000000140000-0x0000000000464000-memory.dmp

Filesize
3.1MB

Download
memory/2032-2-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/2032-9-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/4252-11-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/4252-12-0x000000001BF20000-0x000000001BF70000-memory.dmp

Filesize
320KB

Download
memory/4252-13-0x000000001C030000-0x000000001C0E2000-memory.dmp

Filesize
712KB

Download
memory/4252-16-0x000000001BF70000-0x000000001BF82000-memory.dmp

Filesize
72KB

Download
memory/4252-17-0x000000001BFD0000-0x000000001C00C000-memory.dmp

Filesize
240KB

Download
memory/4252-18-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/4252-19-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/4252-24-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/4252-10-0x00007FFB5E6D0000-0x00007FFB5F191000-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