quasar | c5f16f0da5feac491f0cd84eb08fa2f994f850e64f0e1fe24018b193b06294fb

General

Target

BRAVE0DELAYTWEAK.exe
Size

3.1MB
MD5

55e769e400d3e75b8fe9dffb125227ef
SHA1

f838b94d46a3508733647d77799c85c4e4105570
SHA256

c5f16f0da5feac491f0cd84eb08fa2f994f850e64f0e1fe24018b193b06294fb
SHA512

456a5d0380bb48c9e8e54b1c6838e104526dfd03842c8604c1174dc4c97e8ee092b0272c65013b855b8b4d97c7bfdc70fc751a923940cb9e9899dfddb911e130
SSDEEP

49152:HvjI22SsaNYfdPBldt698dBcjHr+WrqMfnLoGdKTHHB72eh2NT:Hvc22SsaNYfdPBldt6+dBcjHr+WrB

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.167:4782

Mutex

3917b32f-8662-48d7-b61d-8cea2441c8ec

Attributes

encryption_key
72E193AB5763F565E9AFABEC0486B91F3F3A0AE2
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/2044-1-0x0000000000840000-0x0000000000B64000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023e24-5.dat	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
19	1000	Process not Found

Executes dropped EXE 1 IoCs

pid	Process
112	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
4776	schtasks.exe
1540	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2044	BRAVE0DELAYTWEAK.exe
Token: SeDebugPrivilege	112	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
112	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2044 wrote to memory of 4776	2044	BRAVE0DELAYTWEAK.exe	89
PID 2044 wrote to memory of 4776	2044	BRAVE0DELAYTWEAK.exe	89
PID 2044 wrote to memory of 112	2044	BRAVE0DELAYTWEAK.exe	91
PID 2044 wrote to memory of 112	2044	BRAVE0DELAYTWEAK.exe	91
PID 112 wrote to memory of 1540	112	Client.exe	92
PID 112 wrote to memory of 1540	112	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\BRAVE0DELAYTWEAK.exe
"C:\Users\Admin\AppData\Local\Temp\BRAVE0DELAYTWEAK.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2044
- 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:4776
- 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:112
- - 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:1540

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIzIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU4NjAiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODIxNjMwOTAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI0OTgxMjMzMDUyIi8-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
55e769e400d3e75b8fe9dffb125227ef

SHA1
f838b94d46a3508733647d77799c85c4e4105570

SHA256
c5f16f0da5feac491f0cd84eb08fa2f994f850e64f0e1fe24018b193b06294fb

SHA512
456a5d0380bb48c9e8e54b1c6838e104526dfd03842c8604c1174dc4c97e8ee092b0272c65013b855b8b4d97c7bfdc70fc751a923940cb9e9899dfddb911e130

Download Submit
memory/112-9-0x00007FF8786B0000-0x00007FF879171000-memory.dmp

Filesize
10.8MB

Download
memory/112-10-0x00007FF8786B0000-0x00007FF879171000-memory.dmp

Filesize
10.8MB

Download
memory/112-11-0x000000001B740000-0x000000001B790000-memory.dmp

Filesize
320KB

Download
memory/112-12-0x000000001B850000-0x000000001B902000-memory.dmp

Filesize
712KB

Download
memory/112-13-0x00007FF8786B0000-0x00007FF879171000-memory.dmp

Filesize
10.8MB

Download
memory/2044-0-0x00007FF8786B3000-0x00007FF8786B5000-memory.dmp

Filesize
8KB

Download
memory/2044-1-0x0000000000840000-0x0000000000B64000-memory.dmp

Filesize
3.1MB

Download
memory/2044-2-0x00007FF8786B0000-0x00007FF879171000-memory.dmp

Filesize
10.8MB

Download
memory/2044-8-0x00007FF8786B0000-0x00007FF879171000-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