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/2932-0-0x0000000001390000-0x00000000016AE000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\XWormV5.6.exe	family_quasar
behavioral1/memory/2608-8-0x0000000001250000-0x000000000156E000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

XWormV5.6.exe

pid process

2608 XWormV5.6.exe

pid	process
2608	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

1932 schtasks.exe
2028 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-deobf.exeXWormV5.6.exe

description pid process

Token: SeDebugPrivilege 2932 Client-deobf.exe
Token: SeDebugPrivilege 2608 XWormV5.6.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

XWormV5.6.exe

pid process

2608 XWormV5.6.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

XWormV5.6.exe

pid process

2608 XWormV5.6.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

XWormV5.6.exe

pid process

2608 XWormV5.6.exe

pid	process
1932	schtasks.exe
2028	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2932	Client-deobf.exe
Token: SeDebugPrivilege	2608	XWormV5.6.exe

pid	process
2608	XWormV5.6.exe

pid	process
2608	XWormV5.6.exe

pid	process
2608	XWormV5.6.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-deobf.exeXWormV5.6.exe

description	pid	process	target process
PID 2932 wrote to memory of 1932	2932	Client-deobf.exe	schtasks.exe
PID 2932 wrote to memory of 1932	2932	Client-deobf.exe	schtasks.exe
PID 2932 wrote to memory of 1932	2932	Client-deobf.exe	schtasks.exe
PID 2932 wrote to memory of 2608	2932	Client-deobf.exe	XWormV5.6.exe
PID 2932 wrote to memory of 2608	2932	Client-deobf.exe	XWormV5.6.exe
PID 2932 wrote to memory of 2608	2932	Client-deobf.exe	XWormV5.6.exe
PID 2608 wrote to memory of 2028	2608	XWormV5.6.exe	schtasks.exe
PID 2608 wrote to memory of 2028	2608	XWormV5.6.exe	schtasks.exe
PID 2608 wrote to memory of 2028	2608	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:2932

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:1932

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:2608

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:2028

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
3.1MB

MD5
d7471180a1a335178c8062f57e2238f2

SHA1
f3e821ce5d1769feb271408746dbccb39e17a9ec

SHA256
520d3a1acd104bda412c4b6b118b2c4177fa5ae9c0294c18d8d81a5c604e946f

SHA512
420eef19289b550a2cdac7227e6c82ceff3e570bd2d37dadcd617804d16492913ecd7acef84d7962e1b081fe701bc3f609728e765a1829b8f597092c51dc6a84

Download Submit
memory/2608-9-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download
memory/2608-8-0x0000000001250000-0x000000000156E000-memory.dmp

Filesize
3.1MB

Download
memory/2608-10-0x000000001B290000-0x000000001B310000-memory.dmp

Filesize
512KB

Download
memory/2608-12-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download
memory/2608-13-0x000000001B290000-0x000000001B310000-memory.dmp

Filesize
512KB

Download
memory/2932-0-0x0000000001390000-0x00000000016AE000-memory.dmp

Filesize
3.1MB

Download
memory/2932-1-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download
memory/2932-2-0x000000001B2F0000-0x000000001B370000-memory.dmp

Filesize
512KB

Download
memory/2932-11-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads