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
behavioral1/memory/3992-0-0x00000000004C0000-0x00000000007DE000-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

2832 XWormV5.6.exe

pid	process
2832	XWormV5.6.exe

Drops file in System32 directory 5 IoCs

Processes:

XWormV5.6.exeClient-deobf.exe

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

2004 schtasks.exe
3076 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-deobf.exeXWormV5.6.exe

description pid process

Token: SeDebugPrivilege 3992 Client-deobf.exe
Token: SeDebugPrivilege 2832 XWormV5.6.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

XWormV5.6.exe

pid process

2832 XWormV5.6.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

XWormV5.6.exe

pid process

2832 XWormV5.6.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

XWormV5.6.exe

pid process

2832 XWormV5.6.exe

pid	process
2004	schtasks.exe
3076	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3992	Client-deobf.exe
Token: SeDebugPrivilege	2832	XWormV5.6.exe

pid	process
2832	XWormV5.6.exe

pid	process
2832	XWormV5.6.exe

pid	process
2832	XWormV5.6.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-deobf.exeXWormV5.6.exe

description	pid	process	target process
PID 3992 wrote to memory of 2004	3992	Client-deobf.exe	schtasks.exe
PID 3992 wrote to memory of 2004	3992	Client-deobf.exe	schtasks.exe
PID 3992 wrote to memory of 2832	3992	Client-deobf.exe	XWormV5.6.exe
PID 3992 wrote to memory of 2832	3992	Client-deobf.exe	XWormV5.6.exe
PID 2832 wrote to memory of 3076	2832	XWormV5.6.exe	schtasks.exe
PID 2832 wrote to memory of 3076	2832	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:3992

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:2004

C:\Windows\system32\SubDir\XWormV5.6.exe
"C:\Windows\system32\SubDir\XWormV5.6.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2832

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:3076

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

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Downloads

C:\Windows\System32\SubDir\XWormV5.6.exe
Filesize
1.7MB

MD5
5872000a6d44129879a9f24ca4c467cf

SHA1
1acb461f28bceaae3f7ad7b48e73e5bfe9bddc98

SHA256
8356730ea44771e23303b2288317545fa381d96b87a704ae293f0882d6bd55bf

SHA512
966e15c0a01488af8784947c4083f6c37074c199815cdb5c73735007ed85aff57339fe066efdaf2fd980612d31ea6dce3b632905253ed1d4073b274068d496af

Download Submit
C:\Windows\system32\SubDir\XWormV5.6.exe
Filesize
1024KB

MD5
1c267130a2ac59fd6c47be9583a1dc38

SHA1
8a9057bb933dbed85c54e965373d7bbbdc1e6213

SHA256
edc61416702ab0d5dba271bed48fed6408f70b38fa07a1d7f7b2906caa6399e1

SHA512
9d4e98a1cac6d6c93198387c06a974ca5c161ce1ae7640499c71a177f4b84f89496aacf17bf1882b6326cdc267316dccbb61e5ad1212cd2cc1ac6e8a14e3dba3

Download Submit
memory/2832-9-0x00007FFCE85B0000-0x00007FFCE9071000-memory.dmp

Filesize
10.8MB

Download
memory/2832-11-0x000000001B790000-0x000000001B7A0000-memory.dmp

Filesize
64KB

Download
memory/2832-12-0x000000001C5E0000-0x000000001C630000-memory.dmp

Filesize
320KB

Download
memory/2832-13-0x000000001C6F0000-0x000000001C7A2000-memory.dmp

Filesize
712KB

Download
memory/3992-0-0x00000000004C0000-0x00000000007DE000-memory.dmp

Filesize
3.1MB

Download
memory/3992-1-0x00007FFCE85B0000-0x00007FFCE9071000-memory.dmp

Filesize
10.8MB

Download
memory/3992-2-0x000000001B4C0000-0x000000001B4D0000-memory.dmp

Filesize
64KB

Download
memory/3992-10-0x00007FFCE85B0000-0x00007FFCE9071000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads