quasar | 520d3a1acd104bda412c4b6b118b2c4177fa5ae9c0294c18d8d81a5c604e946f

General

Target

Client-deobf.exe
Size

3.1MB
MD5

d7471180a1a335178c8062f57e2238f2
SHA1

f3e821ce5d1769feb271408746dbccb39e17a9ec
SHA256

520d3a1acd104bda412c4b6b118b2c4177fa5ae9c0294c18d8d81a5c604e946f
SHA512

420eef19289b550a2cdac7227e6c82ceff3e570bd2d37dadcd617804d16492913ecd7acef84d7962e1b081fe701bc3f609728e765a1829b8f597092c51dc6a84
SSDEEP

49152:H9taZ7HYaFI1ITamlivhumFgWdFxUhxGqTHHB72eh2NT:H9tapHYaFI1ITamliJumFg0x

Score

10^/10

quasar slave spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Slave

C2

140.238.91.110:34353

Mutex

25ab9d56-6ef2-47d3-99aa-2142fbcd41fa

Attributes

encryption_key
8E710985199C6BF86CCE90DA92448A36E2F45F51
install_name
XWormV5.6.exe
log_directory
WindowsUPDLogs
reconnect_delay
3000
startup_key
Windows BIOS Update Checker
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4864-0-0x0000000000E20000-0x000000000113E000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\XWormV5.6.exe	family_quasar
C:\Windows\system32\SubDir\XWormV5.6.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

XWormV5.6.exe

pid process

452 XWormV5.6.exe

pid	process
452	XWormV5.6.exe

Drops file in System32 directory 3 IoCs

Processes:

Client-deobf.exe

description	ioc	process
File created	C:\Windows\system32\SubDir\XWormV5.6.exe	Client-deobf.exe
File opened for modification	C:\Windows\system32\SubDir\XWormV5.6.exe	Client-deobf.exe
File opened for modification	C:\Windows\system32\SubDir	Client-deobf.exe

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

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1980 schtasks.exe
3728 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-deobf.exeXWormV5.6.exe

description pid process

Token: SeDebugPrivilege 4864 Client-deobf.exe
Token: SeDebugPrivilege 452 XWormV5.6.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

XWormV5.6.exe

pid process

452 XWormV5.6.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

XWormV5.6.exe

pid process

452 XWormV5.6.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

XWormV5.6.exe

pid process

452 XWormV5.6.exe

pid	process
1980	schtasks.exe
3728	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4864	Client-deobf.exe
Token: SeDebugPrivilege	452	XWormV5.6.exe

pid	process
452	XWormV5.6.exe

pid	process
452	XWormV5.6.exe

pid	process
452	XWormV5.6.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-deobf.exeXWormV5.6.exe

description	pid	process	target process
PID 4864 wrote to memory of 1980	4864	Client-deobf.exe	schtasks.exe
PID 4864 wrote to memory of 1980	4864	Client-deobf.exe	schtasks.exe
PID 4864 wrote to memory of 452	4864	Client-deobf.exe	XWormV5.6.exe
PID 4864 wrote to memory of 452	4864	Client-deobf.exe	XWormV5.6.exe
PID 452 wrote to memory of 3728	452	XWormV5.6.exe	schtasks.exe
PID 452 wrote to memory of 3728	452	XWormV5.6.exe	schtasks.exe

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-deobf.exe
"C:\Users\Admin\AppData\Local\Temp\Client-deobf.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4864

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows BIOS Update Checker" /sc ONLOGON /tr "C:\Windows\system32\SubDir\XWormV5.6.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1980

C:\Windows\system32\SubDir\XWormV5.6.exe
"C:\Windows\system32\SubDir\XWormV5.6.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:452

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows BIOS Update Checker" /sc ONLOGON /tr "C:\Windows\system32\SubDir\XWormV5.6.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:3728

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Windows\System32\SubDir\XWormV5.6.exe
Filesize
2.9MB

MD5
76b1a32232060052edd19572b50c62d2

SHA1
7af522add1677de286341bc1425fba741646e8fb

SHA256
60e7352244a646f5af0df2ef277ac3e7382045596873b735c1eced99b710d3ac

SHA512
4dfdeb0e927a1fdb01b2793be2fa0f8afb755731b097d063ef8ef58197e0dc1f3d0cb826de5885c50c446602a7d57a05baaa88e2946fc7401d0d7c71ea3335e9

Download Submit
C:\Windows\system32\SubDir\XWormV5.6.exe
Filesize
2.4MB

MD5
7d87a46d95709b1c6720693510424764

SHA1
5c0824a1a990e7912ec42702df5ae755d6e5be9e

SHA256
9f06701a153b3634a0bc203ba65803bb44eb6e0f25c7c28496f1e66fdf1d9fca

SHA512
b39a7d95545dab1156868e0364b455a01f31f30e35046dd36993826cf2a52d4a6cc5c88d876574497718d82bbc503aad04736bae7109d4b68b0373d66414ee29

Download Submit
memory/452-9-0x00007FFB24820000-0x00007FFB252E1000-memory.dmp

Filesize
10.8MB

Download
memory/452-11-0x000000001C130000-0x000000001C180000-memory.dmp

Filesize
320KB

Download
memory/452-12-0x000000001C240000-0x000000001C2F2000-memory.dmp

Filesize
712KB

Download
memory/452-13-0x00007FFB24820000-0x00007FFB252E1000-memory.dmp

Filesize
10.8MB

Download
memory/4864-0-0x0000000000E20000-0x000000000113E000-memory.dmp

Filesize
3.1MB

Download
memory/4864-1-0x00007FFB24820000-0x00007FFB252E1000-memory.dmp

Filesize
10.8MB

Download
memory/4864-2-0x00000000018E0000-0x00000000018F0000-memory.dmp

Filesize
64KB

Download
memory/4864-10-0x00007FFB24820000-0x00007FFB252E1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

Loading Replay Monitor...

Downloads