quasar | 7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

General

Target

2785b4bbb80b75836c685ac8a1a24f27.exe
Size

534KB
MD5

2785b4bbb80b75836c685ac8a1a24f27
SHA1

32dcef1d5f8e45655478c3dd960e6f9422af691c
SHA256

7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647
SHA512

fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c
SSDEEP

6144:s8fGLJngzxsoIasFzFMkbcWV3Nce0/4obc4hpqEpZccKHBIAUYpnxVlGy3V8/GVX:WkxfIayFMPzf/m4hp7ncxKRYpn7Em

Score

10^/10

quasar venomrat office01 evasion rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office01

C2

172.81.131.113:4782

Mutex

VNM_MUTEX_OFUOtYdHQP7Y7fAk1P

Attributes

encryption_key
xufMEowCMSpdPlEx87tq
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
mvscs
subdirectory
SubDir

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/4252-132-0x0000000000700000-0x000000000078C000-memory.dmp	disable_win_def
behavioral2/files/0x0001000000022e69-140.dat	disable_win_def
behavioral2/files/0x0001000000022e69-141.dat	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

evasion trojan

Modify Registry

T1112

Modify Existing Service

T1031

Disabling Security Tools

T1089

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	2785b4bbb80b75836c685ac8a1a24f27.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	2785b4bbb80b75836c685ac8a1a24f27.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	2785b4bbb80b75836c685ac8a1a24f27.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	2785b4bbb80b75836c685ac8a1a24f27.exe

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/memory/4252-132-0x0000000000700000-0x000000000078C000-memory.dmp	family_quasar
behavioral2/files/0x0001000000022e69-140.dat	family_quasar
behavioral2/files/0x0001000000022e69-141.dat	family_quasar

VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat

Executes dropped EXE 1 IoCs

pid	Process
4700	Client.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	2785b4bbb80b75836c685ac8a1a24f27.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	2785b4bbb80b75836c685ac8a1a24f27.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	2785b4bbb80b75836c685ac8a1a24f27.exe

Looks up external IP address via web service 1 IoCs

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

flow	ioc
11	ip-api.com

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
1260	schtasks.exe
5084	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4520	powershell.exe
4520	powershell.exe
4252	2785b4bbb80b75836c685ac8a1a24f27.exe
4252	2785b4bbb80b75836c685ac8a1a24f27.exe
4252	2785b4bbb80b75836c685ac8a1a24f27.exe
4252	2785b4bbb80b75836c685ac8a1a24f27.exe
4252	2785b4bbb80b75836c685ac8a1a24f27.exe
4252	2785b4bbb80b75836c685ac8a1a24f27.exe
4252	2785b4bbb80b75836c685ac8a1a24f27.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4252	2785b4bbb80b75836c685ac8a1a24f27.exe
Token: SeDebugPrivilege	4520	powershell.exe
Token: SeDebugPrivilege	4700	Client.exe
Token: SeDebugPrivilege	4700	Client.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4252 wrote to memory of 1260	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	82
PID 4252 wrote to memory of 1260	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	82
PID 4252 wrote to memory of 1260	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	82
PID 4252 wrote to memory of 4700	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	84
PID 4252 wrote to memory of 4700	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	84
PID 4252 wrote to memory of 4700	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	84
PID 4252 wrote to memory of 4520	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	85
PID 4252 wrote to memory of 4520	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	85
PID 4252 wrote to memory of 4520	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	85
PID 4700 wrote to memory of 5084	4700	Client.exe	87
PID 4700 wrote to memory of 5084	4700	Client.exe	87
PID 4700 wrote to memory of 5084	4700	Client.exe	87
PID 4252 wrote to memory of 3696	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	92
PID 4252 wrote to memory of 3696	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	92
PID 4252 wrote to memory of 3696	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	92
PID 3696 wrote to memory of 1732	3696	cmd.exe	94
PID 3696 wrote to memory of 1732	3696	cmd.exe	94
PID 3696 wrote to memory of 1732	3696	cmd.exe	94
PID 4252 wrote to memory of 928	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	95
PID 4252 wrote to memory of 928	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	95
PID 4252 wrote to memory of 928	4252	2785b4bbb80b75836c685ac8a1a24f27.exe	95

C:\Users\Admin\AppData\Local\Temp\2785b4bbb80b75836c685ac8a1a24f27.exe
"C:\Users\Admin\AppData\Local\Temp\2785b4bbb80b75836c685ac8a1a24f27.exe"
1⤵
- Modifies Windows Defender Real-time Protection settings
- Checks computer location settings
- Windows security modification
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4252
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "mvscs" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\2785b4bbb80b75836c685ac8a1a24f27.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1260
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4700
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "mvscs" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:5084
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4520
- 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:3696
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
    3⤵
    PID:1732
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\uAcMK8lzge05.bat" "
  2⤵
  PID:928

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Modify Existing Service

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\Local\Temp\uAcMK8lzge05.bat

Filesize
229B

MD5
4210f7b707b3885acce64ed29e762d88

SHA1
eb6779e62cc8fe427e4c6d40e7a8d144a6a72f01

SHA256
82127dde8df0ea47acf2b8486405aae8c1bc28a77be1b5efc88bba797711db96

SHA512
62c4ca00c746f452d8131ea362c2fe86402b2596290abf137c60c29626be447ca9bd014f5ded03760fd34aff9a35f9d602c2e4e5bb55cbe608ba6bfb9bb2b0d1

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
534KB

MD5
2785b4bbb80b75836c685ac8a1a24f27

SHA1
32dcef1d5f8e45655478c3dd960e6f9422af691c

SHA256
7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

SHA512
fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
534KB

MD5
2785b4bbb80b75836c685ac8a1a24f27

SHA1
32dcef1d5f8e45655478c3dd960e6f9422af691c

SHA256
7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

SHA512
fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

Download Submit
memory/4252-137-0x0000000006250000-0x000000000628C000-memory.dmp

Filesize
240KB

Download
memory/4252-136-0x0000000005E20000-0x0000000005E32000-memory.dmp

Filesize
72KB

Download
memory/4252-135-0x00000000051D0000-0x0000000005236000-memory.dmp

Filesize
408KB

Download
memory/4252-134-0x0000000005030000-0x00000000050C2000-memory.dmp

Filesize
584KB

Download
memory/4252-132-0x0000000000700000-0x000000000078C000-memory.dmp

Filesize
560KB

Download
memory/4252-133-0x00000000054F0000-0x0000000005A94000-memory.dmp

Filesize
5.6MB

Download
memory/4520-151-0x0000000006450000-0x000000000646E000-memory.dmp

Filesize
120KB

Download
memory/4520-152-0x0000000007800000-0x0000000007E7A000-memory.dmp

Filesize
6.5MB

Download
memory/4520-153-0x00000000071B0000-0x00000000071CA000-memory.dmp

Filesize
104KB

Download
memory/4520-144-0x00000000052F0000-0x0000000005918000-memory.dmp

Filesize
6.2MB

Download
memory/4520-149-0x0000000006470000-0x00000000064A2000-memory.dmp

Filesize
200KB

Download
memory/4520-150-0x00000000701C0000-0x000000007020C000-memory.dmp

Filesize
304KB

Download
memory/4520-146-0x0000000005180000-0x00000000051E6000-memory.dmp

Filesize
408KB

Download
memory/4520-145-0x0000000004FE0000-0x0000000005002000-memory.dmp

Filesize
136KB

Download
memory/4520-147-0x0000000005EB0000-0x0000000005ECE000-memory.dmp

Filesize
120KB

Download
memory/4520-154-0x0000000007220000-0x000000000722A000-memory.dmp

Filesize
40KB

Download
memory/4520-155-0x0000000007430000-0x00000000074C6000-memory.dmp

Filesize
600KB

Download
memory/4520-143-0x0000000002580000-0x00000000025B6000-memory.dmp

Filesize
216KB

Download
memory/4520-157-0x00000000073E0000-0x00000000073EE000-memory.dmp

Filesize
56KB

Download
memory/4520-158-0x00000000074F0000-0x000000000750A000-memory.dmp

Filesize
104KB

Download
memory/4520-159-0x00000000074D0000-0x00000000074D8000-memory.dmp

Filesize
32KB

Download
memory/4700-156-0x0000000006B60000-0x0000000006B6A000-memory.dmp

Filesize
40KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads