quasar | 2f35eba6e1984f0a636a49d075055e14dd448b90d3b7149a6971629b783be5d4

General

Target

Client-built.exe
Size

3.1MB
MD5

7908b95d1a5b8eb440ad07e27c005a0b
SHA1

a4d3c6ed420e8e09f73987b584ca0c514c8f76f5
SHA256

2f35eba6e1984f0a636a49d075055e14dd448b90d3b7149a6971629b783be5d4
SHA512

e57ea622c792a3b20ecc00120c9f156048c52e883afe4d39311455114d2016c59e160dce40e0f132fcd31e67487ef1817243abea44cc068aed2a307564c15812
SSDEEP

49152:CvyI22SsaNYfdPBldt698dBcjHONcWKwSoGd4THHB72eh2NT:Cvf22SsaNYfdPBldt6+dBcjHONcWKh

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.3:4782

Mutex

96a4cd4c-9bbc-4b4b-aadd-f1b24f6b17ae

Attributes

encryption_key
701C056B6B6E6B8BE1024245339AC4FAA02875CB
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

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/2868-1-0x0000000000F00000-0x0000000001224000-memory.dmp	family_quasar
behavioral2/files/0x000b000000023cce-8.dat	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
31	2980	Process not Found

Executes dropped EXE 1 IoCs

pid	Process
3836	Client.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.exe

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
1744	MicrosoftEdgeUpdate.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
4152	schtasks.exe
1572	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2868	Client-built.exe
Token: SeDebugPrivilege	3836	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3836	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2868 wrote to memory of 4152	2868	Client-built.exe	89
PID 2868 wrote to memory of 4152	2868	Client-built.exe	89
PID 2868 wrote to memory of 3836	2868	Client-built.exe	91
PID 2868 wrote to memory of 3836	2868	Client-built.exe	91
PID 3836 wrote to memory of 1572	3836	Client.exe	92
PID 3836 wrote to memory of 1572	3836	Client.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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2868
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4152
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3836
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1572

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIxIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU5ODUiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODQ0NDQzNjAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI0NzM5ODUxMjY5Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:1744

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 Location Discovery

1

T1614

System Language Discovery

1

T1614.001

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\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
7908b95d1a5b8eb440ad07e27c005a0b

SHA1
a4d3c6ed420e8e09f73987b584ca0c514c8f76f5

SHA256
2f35eba6e1984f0a636a49d075055e14dd448b90d3b7149a6971629b783be5d4

SHA512
e57ea622c792a3b20ecc00120c9f156048c52e883afe4d39311455114d2016c59e160dce40e0f132fcd31e67487ef1817243abea44cc068aed2a307564c15812

Download Submit
memory/2868-0-0x00007FF876723000-0x00007FF876725000-memory.dmp

Filesize
8KB

Download
memory/2868-1-0x0000000000F00000-0x0000000001224000-memory.dmp

Filesize
3.1MB

Download
memory/2868-2-0x00007FF876720000-0x00007FF8771E1000-memory.dmp

Filesize
10.8MB

Download
memory/2868-9-0x00007FF876720000-0x00007FF8771E1000-memory.dmp

Filesize
10.8MB

Download
memory/3836-10-0x00007FF876720000-0x00007FF8771E1000-memory.dmp

Filesize
10.8MB

Download
memory/3836-11-0x00007FF876720000-0x00007FF8771E1000-memory.dmp

Filesize
10.8MB

Download
memory/3836-12-0x000000001B960000-0x000000001B9B0000-memory.dmp

Filesize
320KB

Download
memory/3836-13-0x000000001BA70000-0x000000001BB22000-memory.dmp

Filesize
712KB

Download
memory/3836-14-0x00007FF876720000-0x00007FF8771E1000-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