quasar | 781d04dfdbfc7d4ac681f23fc8501b29390c42874e59a647273790e3cc073ce0

General

Target

Client-built.exe
Size

3.1MB
MD5

bb1c4dce21f5c456bd7a5e9fd4d97588
SHA1

591fae4f6bdebcaf83ccc1bea37113956b373ad1
SHA256

781d04dfdbfc7d4ac681f23fc8501b29390c42874e59a647273790e3cc073ce0
SHA512

a01d016fb7afdae41787ff8d8d5de355f040fbbd6789ad845d089116c6e0092aeab95cf91ee7e4dbda4dada1c082e9003d61acbfafe4dfa203fa5b999d161b6c
SSDEEP

49152:ivkt62XlaSFNWPjljiFa2RoUYI5FRJ69bR3LoGdKbTHHB72eh2NT:iv462XlaSFNWPjljiFXRoUYI5FRJ6Pa

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

98.218.3.74:4782

Mutex

50e9068f-e8d9-4363-bf89-859954325430

Attributes

encryption_key
3F9AC61EC3C7AFC94074BECB23299DD92BEDC742
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Bob
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/4484-1-0x00000000004D0000-0x00000000007F4000-memory.dmp	family_quasar
behavioral2/files/0x0032000000023ce7-6.dat	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
31	4564	Process not Found

Executes dropped EXE 1 IoCs

pid	Process
2616	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
2420	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
2552	schtasks.exe
4076	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4484	Client-built.exe
Token: SeDebugPrivilege	2616	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2616	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4484 wrote to memory of 2552	4484	Client-built.exe	89
PID 4484 wrote to memory of 2552	4484	Client-built.exe	89
PID 4484 wrote to memory of 2616	4484	Client-built.exe	91
PID 4484 wrote to memory of 2616	4484	Client-built.exe	91
PID 2616 wrote to memory of 4076	2616	Client.exe	92
PID 2616 wrote to memory of 4076	2616	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:4484
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2552
- 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:2616
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4076

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIxIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU5ODUiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODQ0NDQzNjAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI0ODYzNTcyMTExIi8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:2420

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
bb1c4dce21f5c456bd7a5e9fd4d97588

SHA1
591fae4f6bdebcaf83ccc1bea37113956b373ad1

SHA256
781d04dfdbfc7d4ac681f23fc8501b29390c42874e59a647273790e3cc073ce0

SHA512
a01d016fb7afdae41787ff8d8d5de355f040fbbd6789ad845d089116c6e0092aeab95cf91ee7e4dbda4dada1c082e9003d61acbfafe4dfa203fa5b999d161b6c

Download Submit
memory/2616-9-0x00007FFB523C0000-0x00007FFB52E81000-memory.dmp

Filesize
10.8MB

Download
memory/2616-11-0x00007FFB523C0000-0x00007FFB52E81000-memory.dmp

Filesize
10.8MB

Download
memory/2616-12-0x000000001AED0000-0x000000001AF20000-memory.dmp

Filesize
320KB

Download
memory/2616-13-0x000000001BB70000-0x000000001BC22000-memory.dmp

Filesize
712KB

Download
memory/2616-15-0x00007FFB523C0000-0x00007FFB52E81000-memory.dmp

Filesize
10.8MB

Download
memory/4484-0-0x00007FFB523C3000-0x00007FFB523C5000-memory.dmp

Filesize
8KB

Download
memory/4484-1-0x00000000004D0000-0x00000000007F4000-memory.dmp

Filesize
3.1MB

Download
memory/4484-2-0x00007FFB523C0000-0x00007FFB52E81000-memory.dmp

Filesize
10.8MB

Download
memory/4484-10-0x00007FFB523C0000-0x00007FFB52E81000-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