quasar | 6e17449148526f2169e2d0fdcedd5f599b17e953b29662f74ca0f534ba44589b

General

Target

Client-built.exe
Size

3.1MB
MD5

9f363517377578ac3d7fbb253dcaaf8d
SHA1

d79d53e00bac8145fe06602fe1479d4770d31ab1
SHA256

6e17449148526f2169e2d0fdcedd5f599b17e953b29662f74ca0f534ba44589b
SHA512

0424519b17c3511124d8a7ab6b9e0700106ef01bb157ded9a99cbcb2b599e6f59ea7b235d35ebfe10c1836680eb449d719790641f72d5504232c4c2bd977e73f
SSDEEP

49152:rvCI22SsaNYfdPBldt698dBcjHXAWEpMf/GoGd+THHB72eh2NT:rvP22SsaNYfdPBldt6+dBcjHXAWE5

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

wexodi1642-33696.portmap.host:33696

Mutex

05043f17-0876-45f5-b27b-7f630638e515

Attributes

encryption_key
F4CF0CA55402CFB88BBBA236836AC2C8F476EAF1
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Steam
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/3352-1-0x0000000000850000-0x0000000000B74000-memory.dmp	family_quasar
behavioral2/files/0x0009000000023dfc-6.dat	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
41	1360	Process not Found

Executes dropped EXE 1 IoCs

pid	Process
1956	Client.exe

Drops file in System32 directory 5 IoCs

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

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
876	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
2372	schtasks.exe
400	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3352	Client-built.exe
Token: SeDebugPrivilege	1956	Client.exe

Suspicious use of FindShellTrayWindow 6 IoCs

pid	Process
1956	Client.exe
1956	Client.exe
1956	Client.exe
1956	Client.exe
1956	Client.exe
1956	Client.exe

Suspicious use of SendNotifyMessage 6 IoCs

pid	Process
1956	Client.exe
1956	Client.exe
1956	Client.exe
1956	Client.exe
1956	Client.exe
1956	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3352 wrote to memory of 400	3352	Client-built.exe	89
PID 3352 wrote to memory of 400	3352	Client-built.exe	89
PID 3352 wrote to memory of 1956	3352	Client-built.exe	91
PID 3352 wrote to memory of 1956	3352	Client-built.exe	91
PID 1956 wrote to memory of 2372	1956	Client.exe	92
PID 1956 wrote to memory of 2372	1956	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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3352
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Steam" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:400
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.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:1956
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Steam" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2372

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIxIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU4NjAiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODIxNjMwOTAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MTk4ODEzNjQwIi8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:876

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

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
9f363517377578ac3d7fbb253dcaaf8d

SHA1
d79d53e00bac8145fe06602fe1479d4770d31ab1

SHA256
6e17449148526f2169e2d0fdcedd5f599b17e953b29662f74ca0f534ba44589b

SHA512
0424519b17c3511124d8a7ab6b9e0700106ef01bb157ded9a99cbcb2b599e6f59ea7b235d35ebfe10c1836680eb449d719790641f72d5504232c4c2bd977e73f

Download Submit
memory/1956-9-0x00007FFC69D40000-0x00007FFC6A801000-memory.dmp

Filesize
10.8MB

Download
memory/1956-11-0x00007FFC69D40000-0x00007FFC6A801000-memory.dmp

Filesize
10.8MB

Download
memory/1956-12-0x000000001BE60000-0x000000001BEB0000-memory.dmp

Filesize
320KB

Download
memory/1956-13-0x000000001BF70000-0x000000001C022000-memory.dmp

Filesize
712KB

Download
memory/1956-14-0x00007FFC69D40000-0x00007FFC6A801000-memory.dmp

Filesize
10.8MB

Download
memory/1956-15-0x000000001BE30000-0x000000001BE42000-memory.dmp

Filesize
72KB

Download
memory/1956-16-0x000000001BEF0000-0x000000001BF2C000-memory.dmp

Filesize
240KB

Download
memory/3352-0-0x00007FFC69D43000-0x00007FFC69D45000-memory.dmp

Filesize
8KB

Download
memory/3352-1-0x0000000000850000-0x0000000000B74000-memory.dmp

Filesize
3.1MB

Download
memory/3352-2-0x00007FFC69D40000-0x00007FFC6A801000-memory.dmp

Filesize
10.8MB

Download
memory/3352-10-0x00007FFC69D40000-0x00007FFC6A801000-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