quasar | 4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9

General

Target

4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe
Size

502KB
MD5

4a1a83a32839b83f5b740f3880b02f96
SHA1

889eade4f72e5a7f59b271c834966c63fae88eea
SHA256

4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9
SHA512

8545d981ce9f07a639abc9f8ea87d13d8a2547fc1f674cf5f85894465bc78c9ad2a6fd521f0d8c876006a89719ed4a4648c99985c3b54b7ee420c773f927fdea
SSDEEP

6144:pTEgdc0YtX7IxUpGREW+ngEymrd8Mi5Etqd+yw4UUcEKOb8F9sbB0Uac0cTR3K:pTEgdfY2xUbgEyCT4wywKapz00cdK

Score

10^/10

quasar office64 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office64

C2

87.121.52.241:4000

Mutex

398f3d5d-fcb0-4abf-8107-9e4548750c76

Attributes

encryption_key
1868814443133CA4A17ED63DA213FAB2B29A7853
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Cryptic0 Client
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/2692-1-0x0000000000250000-0x00000000002D4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015cfd-5.dat	family_quasar
behavioral1/memory/2820-9-0x0000000000BF0000-0x0000000000C74000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
2820	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
2700	schtasks.exe
2708	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	2692	4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe
Token: SeDebugPrivilege	2820	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exeClient.exe

description	pid	Process	procid_target
PID 2692 wrote to memory of 2700	2692	4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe	31
PID 2692 wrote to memory of 2700	2692	4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe	31
PID 2692 wrote to memory of 2700	2692	4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe	31
PID 2692 wrote to memory of 2820	2692	4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe	33
PID 2692 wrote to memory of 2820	2692	4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe	33
PID 2692 wrote to memory of 2820	2692	4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe	33
PID 2820 wrote to memory of 2708	2820	Client.exe	34
PID 2820 wrote to memory of 2708	2820	Client.exe	34
PID 2820 wrote to memory of 2708	2820	Client.exe	34

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\4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe
"C:\Users\Admin\AppData\Local\Temp\4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2692
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Cryptic0 Client" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2700
- 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 WriteProcessMemory
  PID:2820
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Cryptic0 Client" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2708

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
502KB

MD5
4a1a83a32839b83f5b740f3880b02f96

SHA1
889eade4f72e5a7f59b271c834966c63fae88eea

SHA256
4bfb85af6e2eef6cd57d28ab22cc963ab27af48c4b8e55553f2cd11ef735bdc9

SHA512
8545d981ce9f07a639abc9f8ea87d13d8a2547fc1f674cf5f85894465bc78c9ad2a6fd521f0d8c876006a89719ed4a4648c99985c3b54b7ee420c773f927fdea

Download Submit
memory/2692-0-0x000007FEF61F3000-0x000007FEF61F4000-memory.dmp

Filesize
4KB

Download
memory/2692-1-0x0000000000250000-0x00000000002D4000-memory.dmp

Filesize
528KB

Download
memory/2692-2-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2692-8-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2820-7-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2820-9-0x0000000000BF0000-0x0000000000C74000-memory.dmp

Filesize
528KB

Download
memory/2820-10-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Filesize
9.9MB

Download
memory/2820-11-0x000007FEF61F0000-0x000007FEF6BDC000-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