quasar | bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c

General

Target

bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
Size

683KB
MD5

a8b9706ed1ca326d4673b88fed84db23
SHA1

72fb18cdcd67d83fe1484b8ff93ba477e8082f7d
SHA256

bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c
SHA512

89c5706bba41e6b25ad1f4431eba26df9145c2292f0c42c64c688851c1882004814bf4444f8013efc1504b4bb2bbb4d11896fec7c2e42088604eedadd28ebb9b

Score

10^/10

quasar venomrat $77systemtelemtry evasion persistence rat rootkit spyware stealer suricata trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

$77systemtelemtry

C2

192.168.0.44:80

67.61.188.107:80

Mutex

VNM_MUTEX_OplgS6EDrflEgnBXyU

Attributes

encryption_key
6opnJj4VnPTLLOS9SdTg
install_name
windowsrc.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Registry Handler
subdirectory
bin

Signatures

Contains code to disable Windows Defender 3 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral2/memory/2284-130-0x0000000000400000-0x00000000004B0000-memory.dmp	disable_win_def
behavioral2/files/0x000800000002314c-137.dat	disable_win_def
behavioral2/files/0x000800000002314c-138.dat	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089

Quasar Payload 3 IoCs

resource	yara_rule
behavioral2/memory/2284-130-0x0000000000400000-0x00000000004B0000-memory.dmp	family_quasar
behavioral2/files/0x000800000002314c-137.dat	family_quasar
behavioral2/files/0x000800000002314c-138.dat	family_quasar

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat
suricata: ET MALWARE Common RAT Connectivity Check Observed
suricata: ET MALWARE Common RAT Connectivity Check Observed
suricata
suricata: ET MALWARE W32/Quasar 1.3/Venom RAT Connectivity Check 3
suricata: ET MALWARE W32/Quasar 1.3/Venom RAT Connectivity Check 3
suricata

Executes dropped EXE 1 IoCs

pid	Process
2196	windowsrc.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Registry Handler = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe\""	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Registry Handler = "\"C:\\Users\\Admin\\AppData\\Roaming\\bin\\windowsrc.exe\""	windowsrc.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
39	ip-api.com
50	api.ipify.org

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

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

T1053

pid	Process
3424	schtasks.exe
4896	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1592	powershell.exe
1592	powershell.exe
2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
Token: SeDebugPrivilege	2196	windowsrc.exe
Token: SeDebugPrivilege	1592	powershell.exe
Token: SeDebugPrivilege	2196	windowsrc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2196	windowsrc.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2284 wrote to memory of 3424	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	86
PID 2284 wrote to memory of 3424	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	86
PID 2284 wrote to memory of 3424	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	86
PID 2284 wrote to memory of 2196	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	88
PID 2284 wrote to memory of 2196	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	88
PID 2284 wrote to memory of 2196	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	88
PID 2284 wrote to memory of 1592	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	89
PID 2284 wrote to memory of 1592	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	89
PID 2284 wrote to memory of 1592	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	89
PID 2196 wrote to memory of 4896	2196	windowsrc.exe	91
PID 2196 wrote to memory of 4896	2196	windowsrc.exe	91
PID 2196 wrote to memory of 4896	2196	windowsrc.exe	91
PID 2284 wrote to memory of 2584	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	102
PID 2284 wrote to memory of 2584	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	102
PID 2284 wrote to memory of 2584	2284	bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe	102
PID 2584 wrote to memory of 3704	2584	cmd.exe	104
PID 2584 wrote to memory of 3704	2584	cmd.exe	104
PID 2584 wrote to memory of 3704	2584	cmd.exe	104

C:\Users\Admin\AppData\Local\Temp\bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe
"C:\Users\Admin\AppData\Local\Temp\bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe"
1⤵
- Checks computer location settings
- Windows security modification
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2284
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "Windows Registry Handler" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3424
- C:\Users\Admin\AppData\Roaming\bin\windowsrc.exe
  "C:\Users\Admin\AppData\Roaming\bin\windowsrc.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2196
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Registry Handler" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\bin\windowsrc.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:4896
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1592
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2584
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
    3⤵
    PID:3704

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

Scheduled Task

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Disabling Security Tools

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\bin\windowsrc.exe

Filesize
683KB

MD5
a8b9706ed1ca326d4673b88fed84db23

SHA1
72fb18cdcd67d83fe1484b8ff93ba477e8082f7d

SHA256
bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c

SHA512
89c5706bba41e6b25ad1f4431eba26df9145c2292f0c42c64c688851c1882004814bf4444f8013efc1504b4bb2bbb4d11896fec7c2e42088604eedadd28ebb9b

Download Submit
C:\Users\Admin\AppData\Roaming\bin\windowsrc.exe

Filesize
683KB

MD5
a8b9706ed1ca326d4673b88fed84db23

SHA1
72fb18cdcd67d83fe1484b8ff93ba477e8082f7d

SHA256
bfc55cb35294fba322924cd2fe7ab9e79875b2cca66419ee5ef6d675b895349c

SHA512
89c5706bba41e6b25ad1f4431eba26df9145c2292f0c42c64c688851c1882004814bf4444f8013efc1504b4bb2bbb4d11896fec7c2e42088604eedadd28ebb9b

Download Submit
memory/1592-144-0x0000000005910000-0x0000000005976000-memory.dmp

Filesize
408KB

Download
memory/1592-157-0x0000000007790000-0x0000000007798000-memory.dmp

Filesize
32KB

Download
memory/1592-156-0x00000000077B0000-0x00000000077CA000-memory.dmp

Filesize
104KB

Download
memory/1592-155-0x00000000076A0000-0x00000000076AE000-memory.dmp

Filesize
56KB

Download
memory/1592-154-0x00000000076F0000-0x0000000007786000-memory.dmp

Filesize
600KB

Download
memory/1592-153-0x00000000074E0000-0x00000000074EA000-memory.dmp

Filesize
40KB

Download
memory/1592-152-0x0000000007250000-0x000000000726A000-memory.dmp

Filesize
104KB

Download
memory/1592-140-0x0000000004B10000-0x0000000004B46000-memory.dmp

Filesize
216KB

Download
memory/1592-141-0x00000000051E0000-0x0000000005808000-memory.dmp

Filesize
6.2MB

Download
memory/1592-151-0x0000000007B40000-0x00000000081BA000-memory.dmp

Filesize
6.5MB

Download
memory/1592-143-0x0000000005110000-0x0000000005132000-memory.dmp

Filesize
136KB

Download
memory/1592-149-0x0000000070360000-0x00000000703AC000-memory.dmp

Filesize
304KB

Download
memory/1592-148-0x0000000007100000-0x0000000007132000-memory.dmp

Filesize
200KB

Download
memory/1592-150-0x00000000070C0000-0x00000000070DE000-memory.dmp

Filesize
120KB

Download
memory/1592-147-0x0000000004E50000-0x0000000004E6E000-memory.dmp

Filesize
120KB

Download
memory/2196-146-0x0000000006A20000-0x0000000006A2A000-memory.dmp

Filesize
40KB

Download
memory/2196-142-0x0000000006690000-0x00000000066CC000-memory.dmp

Filesize
240KB

Download
memory/2284-133-0x0000000005350000-0x00000000053B6000-memory.dmp

Filesize
408KB

Download
memory/2284-131-0x0000000005550000-0x0000000005AF4000-memory.dmp

Filesize
5.6MB

Download
memory/2284-132-0x0000000004E90000-0x0000000004F22000-memory.dmp

Filesize
584KB

Download
memory/2284-134-0x00000000054E0000-0x00000000054F2000-memory.dmp

Filesize
72KB

Download
memory/2284-130-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads