quasar | 1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc

General

Target

msgde.exe
Size

3.1MB
MD5

c9536d9bb5c51fe2741cbf206531c13b
SHA1

5e4e1d68dd06301cf7810fa04589917aadfefad7
SHA256

1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc
SHA512

e3bd730edd61ef54180ca004947cdcd1de88756ecec7f7f46f0a66702e5f271243ff096b0dc3c1e93621948745374fe996704078a64d23a7d049f424e754f5f7
SSDEEP

49152:avBt62XlaSFNWPjljiFa2RoUYI63RJ6TbR3LoGd/THHB72eh2NT:avr62XlaSFNWPjljiFXRoUYI63RJ6F

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

185.228.82.21:4782

Mutex

59c47ccd-e59a-4ccb-933e-f1094e43684c

Attributes

encryption_key
7CDE15C94B12183E5BC0673A57C6342C87E44E2A
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
msgde
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/2492-1-0x00000000002C0000-0x00000000005E4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000017429-6.dat	family_quasar
behavioral1/memory/2096-9-0x0000000000170000-0x0000000000494000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2096	Client.exe

Drops file in System32 directory 5 IoCs

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

pid	Process
1988	schtasks.exe
1920	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2492	msgde.exe
Token: SeDebugPrivilege	2096	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2096	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2492 wrote to memory of 1988	2492	msgde.exe	30
PID 2492 wrote to memory of 1988	2492	msgde.exe	30
PID 2492 wrote to memory of 1988	2492	msgde.exe	30
PID 2492 wrote to memory of 2096	2492	msgde.exe	32
PID 2492 wrote to memory of 2096	2492	msgde.exe	32
PID 2492 wrote to memory of 2096	2492	msgde.exe	32
PID 2096 wrote to memory of 1920	2096	Client.exe	33
PID 2096 wrote to memory of 1920	2096	Client.exe	33
PID 2096 wrote to memory of 1920	2096	Client.exe	33

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\msgde.exe
"C:\Users\Admin\AppData\Local\Temp\msgde.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2492
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "msgde" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1988
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2096
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "msgde" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1920

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
c9536d9bb5c51fe2741cbf206531c13b

SHA1
5e4e1d68dd06301cf7810fa04589917aadfefad7

SHA256
1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc

SHA512
e3bd730edd61ef54180ca004947cdcd1de88756ecec7f7f46f0a66702e5f271243ff096b0dc3c1e93621948745374fe996704078a64d23a7d049f424e754f5f7

Download Submit
memory/2096-8-0x000007FEF5660000-0x000007FEF604C000-memory.dmp

Filesize
9.9MB

Download
memory/2096-9-0x0000000000170000-0x0000000000494000-memory.dmp

Filesize
3.1MB

Download
memory/2096-11-0x000007FEF5660000-0x000007FEF604C000-memory.dmp

Filesize
9.9MB

Download
memory/2096-12-0x000007FEF5660000-0x000007FEF604C000-memory.dmp

Filesize
9.9MB

Download
memory/2096-13-0x000007FEF5660000-0x000007FEF604C000-memory.dmp

Filesize
9.9MB

Download
memory/2492-0-0x000007FEF5663000-0x000007FEF5664000-memory.dmp

Filesize
4KB

Download
memory/2492-1-0x00000000002C0000-0x00000000005E4000-memory.dmp

Filesize
3.1MB

Download
memory/2492-2-0x000007FEF5660000-0x000007FEF604C000-memory.dmp

Filesize
9.9MB

Download
memory/2492-10-0x000007FEF5660000-0x000007FEF604C000-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