quasar | 28a1b5a0e4840bd853d1a9e8f4a48f36af3fd4f38c5cb8273a5fb3df67afcb04

General

Target

Client-built.exe
Size

3.1MB
MD5

bee705cc59266d8ab855c591599b0f09
SHA1

cb2ab1afc9bee0d41786559505abb7220b7f83c8
SHA256

28a1b5a0e4840bd853d1a9e8f4a48f36af3fd4f38c5cb8273a5fb3df67afcb04
SHA512

6971cb2c3ee9efad0e14b162a074b10820a3d0e49f27aeead26302b3e74413033512eb502447b39f0e5776f21c72b8feacd0d0035fefcdbfab72a805eb7d423b
SSDEEP

49152:rvyI22SsaNYfdPBldt698dBcjHctflEmLek/znLVGdn7FTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjHctfhLA7

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

3808ff71-c2df-4538-8d66-6459677347c3

Attributes

encryption_key
24BCF759F51AE66E5C4BF0A521BA79747D6F977F
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/532-1-0x0000000000690000-0x00000000009B4000-memory.dmp	family_quasar
behavioral2/files/0x0009000000023cdc-8.dat	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
48	3176	Process not Found

Executes dropped EXE 1 IoCs

pid	Process
1340	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
5016	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
1768	schtasks.exe
4356	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	532	Client-built.exe
Token: SeDebugPrivilege	1340	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1340	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 532 wrote to memory of 1768	532	Client-built.exe	89
PID 532 wrote to memory of 1768	532	Client-built.exe	89
PID 532 wrote to memory of 1340	532	Client-built.exe	91
PID 532 wrote to memory of 1340	532	Client-built.exe	91
PID 1340 wrote to memory of 4356	1340	Client.exe	92
PID 1340 wrote to memory of 4356	1340	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:532
- 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:1768
- 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:1340
- - 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:4356

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIxIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDQ5MjgiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxNzQzMjM4OTAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MDkwMjA4MDkzIi8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:5016

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

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
bee705cc59266d8ab855c591599b0f09

SHA1
cb2ab1afc9bee0d41786559505abb7220b7f83c8

SHA256
28a1b5a0e4840bd853d1a9e8f4a48f36af3fd4f38c5cb8273a5fb3df67afcb04

SHA512
6971cb2c3ee9efad0e14b162a074b10820a3d0e49f27aeead26302b3e74413033512eb502447b39f0e5776f21c72b8feacd0d0035fefcdbfab72a805eb7d423b

Download Submit
memory/532-0-0x00007FFB8BC93000-0x00007FFB8BC95000-memory.dmp

Filesize
8KB

Download
memory/532-1-0x0000000000690000-0x00000000009B4000-memory.dmp

Filesize
3.1MB

Download
memory/532-2-0x00007FFB8BC90000-0x00007FFB8C751000-memory.dmp

Filesize
10.8MB

Download
memory/532-9-0x00007FFB8BC90000-0x00007FFB8C751000-memory.dmp

Filesize
10.8MB

Download
memory/1340-10-0x00007FFB8BC90000-0x00007FFB8C751000-memory.dmp

Filesize
10.8MB

Download
memory/1340-11-0x00007FFB8BC90000-0x00007FFB8C751000-memory.dmp

Filesize
10.8MB

Download
memory/1340-13-0x000000001C330000-0x000000001C3E2000-memory.dmp

Filesize
712KB

Download
memory/1340-12-0x0000000002C80000-0x0000000002CD0000-memory.dmp

Filesize
320KB

Download
memory/1340-14-0x00007FFB8BC90000-0x00007FFB8C751000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads