quasar | 6a960757025813729fa37ab51a6a7db9c8439d429e078f79717008fc2796b141

General

Target

Client-built.exe
Size

875KB
MD5

8c2785d34b3a6e6fbce972117228a9b4
SHA1

673b9eb1f253903c45834dcba09afcef718599e4
SHA256

6a960757025813729fa37ab51a6a7db9c8439d429e078f79717008fc2796b141
SHA512

c2f184d9a265425b190bc3a900083112a46436bc09907ded7baeaa83c9202f66e73bf036dc2738eac35ca41d049d80f77daf3519e9fe23ed2754264314f2497a
SSDEEP

24576:EGcC7Tt+PSWHIPbcNK0KKfaOwI55l2Sszls1j5:XcC7TmEgKKHwCBsza

Score

10^/10

quasar office04 ransomware spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

1.5.0

Botnet

Office04

C2

Javv-46764.portmap.host:46764

Mutex

c236c7b5-e333-43a3-a991-954c61518c46

Attributes

encryption_key
F5F31C46BB15BEDDB643667BC441A55E746DE4B8
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Modded 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

resource	yara_rule
behavioral1/memory/4248-1-0x0000021EF0730000-0x0000021EF0810000-memory.dmp	family_quasar
behavioral1/memory/4248-2-0x0000021EF0C30000-0x0000021EF0C4A000-memory.dmp	family_quasar
behavioral1/files/0x001a00000002b1cc-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
340	Client.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Drops file in System32 directory 2 IoCs

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

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-167299615-4170584903-1843289874-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\wallpaper.png"	Client.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-167299615-4170584903-1843289874-1000_Classes\Local Settings\MuiCache	MiniSearchHost.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
340	Client.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4248	Client-built.exe
Token: SeDebugPrivilege	340	Client.exe
Token: SeShutdownPrivilege	340	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
340	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1244	MiniSearchHost.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4248 wrote to memory of 340	4248	Client-built.exe	79
PID 4248 wrote to memory of 340	4248	Client-built.exe	79

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:4248
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Sets desktop wallpaper using registry
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  PID:340

C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe
"C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:1244

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Defacement

1

T1491

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
875KB

MD5
8c2785d34b3a6e6fbce972117228a9b4

SHA1
673b9eb1f253903c45834dcba09afcef718599e4

SHA256
6a960757025813729fa37ab51a6a7db9c8439d429e078f79717008fc2796b141

SHA512
c2f184d9a265425b190bc3a900083112a46436bc09907ded7baeaa83c9202f66e73bf036dc2738eac35ca41d049d80f77daf3519e9fe23ed2754264314f2497a

Download Submit
memory/340-10-0x0000024AA6D60000-0x0000024AA6DB0000-memory.dmp

Filesize
320KB

Download
memory/340-11-0x0000024AA7080000-0x0000024AA7132000-memory.dmp

Filesize
712KB

Download
memory/340-12-0x0000024AA6D10000-0x0000024AA6D5E000-memory.dmp

Filesize
312KB

Download
memory/340-15-0x0000024AA7050000-0x0000024AA7062000-memory.dmp

Filesize
72KB

Download
memory/340-16-0x0000024AA72D0000-0x0000024AA730C000-memory.dmp

Filesize
240KB

Download
memory/340-17-0x0000024AA7290000-0x0000024AA72A6000-memory.dmp

Filesize
88KB

Download
memory/4248-0-0x00007FF82D1D3000-0x00007FF82D1D5000-memory.dmp

Filesize
8KB

Download
memory/4248-1-0x0000021EF0730000-0x0000021EF0810000-memory.dmp

Filesize
896KB

Download
memory/4248-2-0x0000021EF0C30000-0x0000021EF0C4A000-memory.dmp

Filesize
104KB

Download
memory/4248-3-0x00007FF82D1D0000-0x00007FF82DC92000-memory.dmp

Filesize
10.8MB

Download
memory/4248-9-0x00007FF82D1D0000-0x00007FF82DC92000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing