quasar | fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee

General

Target

Client-built.exe
Size

502KB
MD5

05aa0a6d16f1dabf72b4c880a5d357d0
SHA1

4a3ebaa010ba5306cd09c07eb26bbe99ff46496f
SHA256

fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee
SHA512

931a147bf27a8a14db99b8f6480dddfa2bd1e0b4aaa59092552ef93e9f93adddbcb71d7d9c7a1f45f7854e32d16555dc7f3be701a2df9578a9e99349e972758a
SSDEEP

6144:pTEgdc0YZXAGbgiIN2RSBX/bbVbkbLyUR3mRfbNcEIHb8F9w/Vg6cTR3K:pTEgdfY1bg7bNk2RB4kiVPcdK

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

69.160.242.105:4782

69.160.242.105:11066

Mutex

66661e0f-33c3-4f2f-88be-1634de535cd1

Attributes

encryption_key
CBED6820557E8011D93BA51D49F569DE8C1F98B4
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java updater
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/2104-1-0x0000000000EC0000-0x0000000000F44000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015d6e-5.dat	family_quasar
behavioral1/memory/2648-7-0x0000000000CD0000-0x0000000000D54000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2648	Client.exe

Drops file in System32 directory 2 IoCs

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

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
2760	schtasks.exe
2848	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2104	Client-built.exe
Token: SeDebugPrivilege	2648	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2648	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2648	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2648	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2104 wrote to memory of 2760	2104	Client-built.exe	30
PID 2104 wrote to memory of 2760	2104	Client-built.exe	30
PID 2104 wrote to memory of 2760	2104	Client-built.exe	30
PID 2104 wrote to memory of 2648	2104	Client-built.exe	32
PID 2104 wrote to memory of 2648	2104	Client-built.exe	32
PID 2104 wrote to memory of 2648	2104	Client-built.exe	32
PID 2648 wrote to memory of 2848	2648	Client.exe	33
PID 2648 wrote to memory of 2848	2648	Client.exe	33
PID 2648 wrote to memory of 2848	2648	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2104
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2760
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2648
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2848

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 Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
502KB

MD5
05aa0a6d16f1dabf72b4c880a5d357d0

SHA1
4a3ebaa010ba5306cd09c07eb26bbe99ff46496f

SHA256
fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee

SHA512
931a147bf27a8a14db99b8f6480dddfa2bd1e0b4aaa59092552ef93e9f93adddbcb71d7d9c7a1f45f7854e32d16555dc7f3be701a2df9578a9e99349e972758a

Download Submit
memory/2104-0-0x000007FEF5A23000-0x000007FEF5A24000-memory.dmp

Filesize
4KB

Download
memory/2104-1-0x0000000000EC0000-0x0000000000F44000-memory.dmp

Filesize
528KB

Download
memory/2104-2-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

Filesize
9.9MB

Download
memory/2104-10-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

Filesize
9.9MB

Download
memory/2648-8-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

Filesize
9.9MB

Download
memory/2648-7-0x0000000000CD0000-0x0000000000D54000-memory.dmp

Filesize
528KB

Download
memory/2648-9-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

Filesize
9.9MB

Download
memory/2648-11-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

Filesize
9.9MB

Download
memory/2648-12-0x000007FEF5A20000-0x000007FEF640C000-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