quasar | 1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc

General

Target

1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.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 2 IoCs

resource	yara_rule
behavioral2/memory/3660-1-0x00000000003C0000-0x00000000006E4000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cb6-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3864	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.exe
File opened for modification	C:\Windows\system32\SubDir	1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.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
5104	schtasks.exe
2712	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3660	1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.exe
Token: SeDebugPrivilege	3864	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3864	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3660 wrote to memory of 5104	3660	1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.exe	83
PID 3660 wrote to memory of 5104	3660	1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.exe	83
PID 3660 wrote to memory of 3864	3660	1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.exe	85
PID 3660 wrote to memory of 3864	3660	1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.exe	85
PID 3864 wrote to memory of 2712	3864	Client.exe	86
PID 3864 wrote to memory of 2712	3864	Client.exe	86

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\1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.exe
"C:\Users\Admin\AppData\Local\Temp\1dff2a45e9861cdcb8741dd196123e32e2b9004b950ee21b9bacc9f99be14fdc.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3660
- 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:5104
- 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:3864
- - 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:2712

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/3660-10-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

Filesize
10.8MB

Download
memory/3660-1-0x00000000003C0000-0x00000000006E4000-memory.dmp

Filesize
3.1MB

Download
memory/3660-2-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

Filesize
10.8MB

Download
memory/3660-0-0x00007FFD4F463000-0x00007FFD4F465000-memory.dmp

Filesize
8KB

Download
memory/3864-11-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

Filesize
10.8MB

Download
memory/3864-9-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

Filesize
10.8MB

Download
memory/3864-12-0x000000001BC30000-0x000000001BC80000-memory.dmp

Filesize
320KB

Download
memory/3864-13-0x000000001C460000-0x000000001C512000-memory.dmp

Filesize
712KB

Download
memory/3864-16-0x000000001C400000-0x000000001C412000-memory.dmp

Filesize
72KB

Download
memory/3864-17-0x000000001CC70000-0x000000001CCAC000-memory.dmp

Filesize
240KB

Download
memory/3864-18-0x000000001C960000-0x000000001CA62000-memory.dmp

Filesize
1.0MB

Download
memory/3864-19-0x00007FFD4F460000-0x00007FFD4FF21000-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