quasar | c8336d18c3361816fc9d6470ca313a41ca92878e8e465ccc2350d79d0e38ea09

General

Target

MODEST MENU.exe
Size

3.1MB
MD5

dbe6648163a38bf88d16cd46cba60725
SHA1

8e6456d6eb5a41be657e00e652685c6441e2ab9c
SHA256

c8336d18c3361816fc9d6470ca313a41ca92878e8e465ccc2350d79d0e38ea09
SHA512

81629676796e90b62ef26013318e1969148b7cf5e1e4cfe5456a84fa775f40b55fe7bb8ce47157beb91ecc6595f9128296c94cc05c4f2f77e508b6b0f014829f
SSDEEP

49152:GvyI22SsaNYfdPBldt698dBcjHTUaEEak2k/mF6oGdwGTHHB72eh2NT:Gvf22SsaNYfdPBldt6+dBcjHTUamEg

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.29.147:4782

Mutex

7b6a0219-487d-4153-aef3-d8965465527b

Attributes

encryption_key
C56BB8ACD2D4627CA39E0620C2CCEBAD8A4F4FF8
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 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2384-1-0x0000000000C40000-0x0000000000F64000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/2100-9-0x0000000000030000-0x0000000000354000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2100 Client.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

Processes:

schtasks.exeschtasks.exe

pid process

1228 schtasks.exe
2140 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

MODEST MENU.exeClient.exe

description pid process

Token: SeDebugPrivilege 2384 MODEST MENU.exe
Token: SeDebugPrivilege 2100 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2100 Client.exe

pid	process
2100	Client.exe

pid	process
1228	schtasks.exe
2140	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2384	MODEST MENU.exe
Token: SeDebugPrivilege	2100	Client.exe

pid	process
2100	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

MODEST MENU.exeClient.exe

description	pid	process	target process
PID 2384 wrote to memory of 1228	2384	MODEST MENU.exe	schtasks.exe
PID 2384 wrote to memory of 1228	2384	MODEST MENU.exe	schtasks.exe
PID 2384 wrote to memory of 1228	2384	MODEST MENU.exe	schtasks.exe
PID 2384 wrote to memory of 2100	2384	MODEST MENU.exe	Client.exe
PID 2384 wrote to memory of 2100	2384	MODEST MENU.exe	Client.exe
PID 2384 wrote to memory of 2100	2384	MODEST MENU.exe	Client.exe
PID 2100 wrote to memory of 2140	2100	Client.exe	schtasks.exe
PID 2100 wrote to memory of 2140	2100	Client.exe	schtasks.exe
PID 2100 wrote to memory of 2140	2100	Client.exe	schtasks.exe

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\MODEST MENU.exe
"C:\Users\Admin\AppData\Local\Temp\MODEST MENU.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2384
- 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:1228
- 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:2100
- - 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:2140

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

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
dbe6648163a38bf88d16cd46cba60725

SHA1
8e6456d6eb5a41be657e00e652685c6441e2ab9c

SHA256
c8336d18c3361816fc9d6470ca313a41ca92878e8e465ccc2350d79d0e38ea09

SHA512
81629676796e90b62ef26013318e1969148b7cf5e1e4cfe5456a84fa775f40b55fe7bb8ce47157beb91ecc6595f9128296c94cc05c4f2f77e508b6b0f014829f

Download Submit
memory/2100-10-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2100-9-0x0000000000030000-0x0000000000354000-memory.dmp

Filesize
3.1MB

Download
memory/2100-11-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2100-12-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2384-0-0x000007FEF57C3000-0x000007FEF57C4000-memory.dmp

Filesize
4KB

Download
memory/2384-1-0x0000000000C40000-0x0000000000F64000-memory.dmp

Filesize
3.1MB

Download
memory/2384-2-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2384-8-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads