quasar | 7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d

Analysis

max time kernel
20s
max time network
26s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
29-01-2023 17:30

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General

Target

7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d.exe
Size

1.0MB
MD5

1def40ae6fbb8b8f438b7370a6f4ab2d
SHA1

0f59d0792f223b54901e109f5ae98a3ec4acc049
SHA256

7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d
SHA512

f3554bf9d7ba8bd1fbe137c4da19b99a2f486456b3e61e909b3b13af724244d9fe0cf421678d247ceb3934d1c928d203847a4e487f3fcf797cdc45a86ffd599d
SSDEEP

24576:+cvkTLn+3Z3dwNTY8wKxHCtAxlSPU5JpoLww2A716yGGMaYnHfGZgj9h1i:ZvkTD+3Z3ypYNKBIAzSPwD8EQ/q/qgI

Score

10^/10

quasar venomrat office04 evasion rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

127.0.0.1:4782

rat94522.ddnsking.com:4000

Mutex

VNM_MUTEX_c2q7y2ayYutZ2XaYe7

Attributes

encryption_key
WIwQFd2V7FhUXFH7QX71
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Venom Client Startup
subdirectory
SubDir

Signatures

Contains code to disable Windows Defender 5 IoCs

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

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\file1.exe	disable_win_def
C:\Users\Admin\AppData\Local\Temp\file1.exe	disable_win_def
behavioral2/memory/1844-148-0x0000000000FA0000-0x000000000102C000-memory.dmp	disable_win_def
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	disable_win_def
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	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

Processes:

file1.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	file1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	file1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	file1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	file1.exe

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

Quasar payload 5 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\file1.exe	family_quasar
C:\Users\Admin\AppData\Local\Temp\file1.exe	family_quasar
behavioral2/memory/1844-148-0x0000000000FA0000-0x000000000102C000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	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 3 IoCs

Processes:

Crypted.exefile1.exeClient.exe

pid process

1156 Crypted.exe
1844 file1.exe
5056 Client.exe

pid	process
1156	Crypted.exe
1844	file1.exe
5056	Client.exe

Checks computer location settings 2 TTPs 3 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

Client.exe7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d.exefile1.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	Client.exe
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d.exe
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	file1.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

file1.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	file1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	file1.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.

Processes:

flow ioc

17 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
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2704 5056 WerFault.exe Client.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

5048 timeout.exe
Suspicious behavior: EnumeratesProcesses 9 IoCs

Processes:

powershell.exefile1.exe

pid process

1396 powershell.exe
1396 powershell.exe
1844 file1.exe
1844 file1.exe
1844 file1.exe
1844 file1.exe
1844 file1.exe
1844 file1.exe
1844 file1.exe

flow	ioc
17	ip-api.com

pid	pid_target	process	target process
2704	5056	WerFault.exe	Client.exe

pid	process
5048	timeout.exe

pid	process
1396	powershell.exe
1396	powershell.exe
1844	file1.exe
1844	file1.exe
1844	file1.exe
1844	file1.exe
1844	file1.exe
1844	file1.exe
1844	file1.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

file1.exepowershell.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	1844	file1.exe
Token: SeDebugPrivilege	1396	powershell.exe
Token: SeDebugPrivilege	5056	Client.exe
Token: SeDebugPrivilege	5056	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

5056 Client.exe

pid	process
5056	Client.exe

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d.execmd.exeCrypted.exefile1.execmd.exeClient.exe

description	pid	process	target process
PID 4992 wrote to memory of 3784	4992	7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d.exe	cmd.exe
PID 4992 wrote to memory of 3784	4992	7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d.exe	cmd.exe
PID 3784 wrote to memory of 5048	3784	cmd.exe	timeout.exe
PID 3784 wrote to memory of 5048	3784	cmd.exe	timeout.exe
PID 3784 wrote to memory of 1156	3784	cmd.exe	Crypted.exe
PID 3784 wrote to memory of 1156	3784	cmd.exe	Crypted.exe
PID 3784 wrote to memory of 1156	3784	cmd.exe	Crypted.exe
PID 1156 wrote to memory of 1844	1156	Crypted.exe	file1.exe
PID 1156 wrote to memory of 1844	1156	Crypted.exe	file1.exe
PID 1156 wrote to memory of 1844	1156	Crypted.exe	file1.exe
PID 1844 wrote to memory of 5056	1844	file1.exe	Client.exe
PID 1844 wrote to memory of 5056	1844	file1.exe	Client.exe
PID 1844 wrote to memory of 5056	1844	file1.exe	Client.exe
PID 1844 wrote to memory of 1396	1844	file1.exe	powershell.exe
PID 1844 wrote to memory of 1396	1844	file1.exe	powershell.exe
PID 1844 wrote to memory of 1396	1844	file1.exe	powershell.exe
PID 1844 wrote to memory of 1988	1844	file1.exe	cmd.exe
PID 1844 wrote to memory of 1988	1844	file1.exe	cmd.exe
PID 1844 wrote to memory of 1988	1844	file1.exe	cmd.exe
PID 1844 wrote to memory of 4704	1844	file1.exe	cmd.exe
PID 1844 wrote to memory of 4704	1844	file1.exe	cmd.exe
PID 1844 wrote to memory of 4704	1844	file1.exe	cmd.exe
PID 1988 wrote to memory of 1820	1988	cmd.exe	cmd.exe
PID 1988 wrote to memory of 1820	1988	cmd.exe	cmd.exe
PID 1988 wrote to memory of 1820	1988	cmd.exe	cmd.exe
PID 5056 wrote to memory of 4128	5056	Client.exe	cmd.exe
PID 5056 wrote to memory of 4128	5056	Client.exe	cmd.exe
PID 5056 wrote to memory of 4128	5056	Client.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d.exe
"C:\Users\Admin\AppData\Local\Temp\7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4992

C:\Windows\system32\cmd.exe
"C:\Windows\sysnative\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\C950.tmp\C951.tmp\C952.bat C:\Users\Admin\AppData\Local\Temp\7cbcebf57f666bc42f8e6b3bba459cf968d19690e7d983e943b77fb97acb487d.exe"
2⤵
- Suspicious use of WriteProcessMemory
PID:3784

C:\Windows\system32\timeout.exe
timeout 2
3⤵
- Delays execution with timeout.exe
PID:5048

C:\Users\Admin\AppData\Local\Temp\Crypted.exe
Crypted.exe
3⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1156

C:\Users\Admin\AppData\Local\Temp\file1.exe
C:\Users\Admin\AppData\Local\Temp\\file1.exe
4⤵
- Modifies Windows Defender Real-time Protection settings
- Executes dropped EXE
- Checks computer location settings
- Windows security modification
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1844

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
5⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5056

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\O8j1oGiR7QL9.bat" "
6⤵
PID:4128

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 5056 -s 2236
6⤵
- Program crash
PID:2704

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"powershell" Get-MpPreference -verbose
5⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1396

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
5⤵
- Suspicious use of WriteProcessMemory
PID:1988

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
6⤵
PID:1820

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\NdVis7bJuWdq.bat" "
5⤵
PID:4704

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 356 -p 5056 -ip 5056
1⤵
PID:1664

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Disabling Security Tools

T1089

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\C950.tmp\C951.tmp\C952.bat
Filesize
72B

MD5
532fe973c7846cd45dd713eab9ccf5a2

SHA1
5c7ffe8a5f2ae88c6edc261e96dcdabbf9c357c6

SHA256
704862a14c3b03e464cde36c6dfff69bd6f835638a57ddcda697ccae2eaf620e

SHA512
fe3d666e611ab797fee9df860bf1719775d90e32d94b3b7d658c82e7e973790e360fb4294c76c169c4d26603b59347d9387bf0a16e143e69e9a34b7cfd6dfd27

Download Submit
C:\Users\Admin\AppData\Local\Temp\Crypted.exe
Filesize
1.3MB

MD5
83a4b7e779273cdd46484d8729de3f60

SHA1
379d4fbc70f9c60be123df0625c91d33cdf96b03

SHA256
6db7af352ce10f844fb03b03a7caa443bde6bff14bdfc2fc2ee14b67b5700217

SHA512
8c0488edd77155c12aaa6529c7eadcd2e9894edb3c50430208e7f8f9bc68c834831c8be14e3a97942d81db8a78347b02bfb99f04a076fdeebb3d943e2e590d71

Download Submit
C:\Users\Admin\AppData\Local\Temp\Crypted.exe
Filesize
1.3MB

MD5
83a4b7e779273cdd46484d8729de3f60

SHA1
379d4fbc70f9c60be123df0625c91d33cdf96b03

SHA256
6db7af352ce10f844fb03b03a7caa443bde6bff14bdfc2fc2ee14b67b5700217

SHA512
8c0488edd77155c12aaa6529c7eadcd2e9894edb3c50430208e7f8f9bc68c834831c8be14e3a97942d81db8a78347b02bfb99f04a076fdeebb3d943e2e590d71

Download Submit
C:\Users\Admin\AppData\Local\Temp\NdVis7bJuWdq.bat
Filesize
202B

MD5
1beba150f8280009f3bb3befaa7f155c

SHA1
38c5df1e9468322f7c61e9af8d86b62d12bbe0df

SHA256
f0a8d9f0f615531032e899e7789d52a1531e1cbba7cef885bc0f34a13afc8b8a

SHA512
e9561a88ec4d56c7f393f62d52cf797751ef256add76d63a86805d706472617aa84643d172db8fad49b54c14012b6c6ac1e0b45fb90a8e7671c0710afc665d74

Download Submit
C:\Users\Admin\AppData\Local\Temp\O8j1oGiR7QL9.bat
Filesize
207B

MD5
e267935396186cba2bb9679b3bfcf307

SHA1
391f3b284b27096ce1fe72685ae202828caadc29

SHA256
a85207337846608806a575d81590492d389945a0c0e8ce9d80e881257d536a61

SHA512
6fd886ed3974bb066e7314cfe146e86f6c9244390265224850c71adb8ff255d734736ec07f862757f7bd4a600f1e943e590f730404cf2c93afc578a920915c8d

Download Submit
C:\Users\Admin\AppData\Local\Temp\file1.exe
Filesize
534KB

MD5
c3e9d09f741548288dae2d21cdd8d05a

SHA1
79245cec78e2793ba75cbadc88b30aebd13cf9d9

SHA256
0fe098471d1c513f29fbcd3a7c10deb467bb62aa35da59cca1b88b16f6c88db5

SHA512
cea14fa657f3779008fde0acdcf94880b26662a49009e2ac5fcdd85a6fc36d736df3d5e67af6ae6b20a76c6734dbc3a849433b002be9c803a62abd4d2ce3dbca

Download Submit
C:\Users\Admin\AppData\Local\Temp\file1.exe
Filesize
534KB

MD5
c3e9d09f741548288dae2d21cdd8d05a

SHA1
79245cec78e2793ba75cbadc88b30aebd13cf9d9

SHA256
0fe098471d1c513f29fbcd3a7c10deb467bb62aa35da59cca1b88b16f6c88db5

SHA512
cea14fa657f3779008fde0acdcf94880b26662a49009e2ac5fcdd85a6fc36d736df3d5e67af6ae6b20a76c6734dbc3a849433b002be9c803a62abd4d2ce3dbca

Download Submit
C:\Users\Admin\AppData\Local\Temp\version.html
Filesize
19B

MD5
6d2eb7ff01d1c70656ab0f3869fac94f

SHA1
04fe25b56e129532d8fabe557901e39f2977306b

SHA256
e8541e5141dfc37099209e4fbdb3c527ba4c8bd81b10fa111a66d2d1bc81c2e2

SHA512
1b9fa8b039acd2c84ecd2088470b02857e9b1810f3f55d258f0152513fb33dfdc6758e46fe6ed3e9cabad62015d537d6f7acbf06ee35089e75d3aaff4127e555

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
534KB

MD5
c3e9d09f741548288dae2d21cdd8d05a

SHA1
79245cec78e2793ba75cbadc88b30aebd13cf9d9

SHA256
0fe098471d1c513f29fbcd3a7c10deb467bb62aa35da59cca1b88b16f6c88db5

SHA512
cea14fa657f3779008fde0acdcf94880b26662a49009e2ac5fcdd85a6fc36d736df3d5e67af6ae6b20a76c6734dbc3a849433b002be9c803a62abd4d2ce3dbca

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
534KB

MD5
c3e9d09f741548288dae2d21cdd8d05a

SHA1
79245cec78e2793ba75cbadc88b30aebd13cf9d9

SHA256
0fe098471d1c513f29fbcd3a7c10deb467bb62aa35da59cca1b88b16f6c88db5

SHA512
cea14fa657f3779008fde0acdcf94880b26662a49009e2ac5fcdd85a6fc36d736df3d5e67af6ae6b20a76c6734dbc3a849433b002be9c803a62abd4d2ce3dbca

Download Submit
memory/1156-142-0x0000000004CB0000-0x0000000004CBA000-memory.dmp

Filesize
40KB

Download
memory/1156-139-0x0000000004CD0000-0x0000000004D6C000-memory.dmp

Filesize
624KB

Download
memory/1156-143-0x0000000004E90000-0x0000000004EE6000-memory.dmp

Filesize
344KB

Download
memory/1156-141-0x0000000004D70000-0x0000000004E02000-memory.dmp

Filesize
584KB

Download
memory/1156-140-0x00000000053E0000-0x0000000005984000-memory.dmp

Filesize
5.6MB

Download
memory/1156-135-0x0000000000000000-mapping.dmp

Download
memory/1156-138-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/1396-167-0x0000000007D70000-0x0000000007E06000-memory.dmp

Filesize
600KB

Download
memory/1396-162-0x00000000704C0000-0x000000007050C000-memory.dmp

Filesize
304KB

Download
memory/1396-170-0x0000000007E10000-0x0000000007E18000-memory.dmp

Filesize
32KB

Download
memory/1396-155-0x0000000000000000-mapping.dmp

Download
memory/1396-169-0x0000000007E30000-0x0000000007E4A000-memory.dmp

Filesize
104KB

Download
memory/1396-168-0x0000000007D20000-0x0000000007D2E000-memory.dmp

Filesize
56KB

Download
memory/1396-166-0x0000000007B60000-0x0000000007B6A000-memory.dmp

Filesize
40KB

Download
memory/1396-156-0x0000000005210000-0x0000000005246000-memory.dmp

Filesize
216KB

Download
memory/1396-157-0x00000000059B0000-0x0000000005FD8000-memory.dmp

Filesize
6.2MB

Download
memory/1396-158-0x0000000005940000-0x0000000005962000-memory.dmp

Filesize
136KB

Download
memory/1396-159-0x0000000006110000-0x0000000006176000-memory.dmp

Filesize
408KB

Download
memory/1396-160-0x00000000067D0000-0x00000000067EE000-memory.dmp

Filesize
120KB

Download
memory/1396-161-0x0000000007980000-0x00000000079B2000-memory.dmp

Filesize
200KB

Download
memory/1396-165-0x0000000007AE0000-0x0000000007AFA000-memory.dmp

Filesize
104KB

Download
memory/1396-163-0x0000000006D90000-0x0000000006DAE000-memory.dmp

Filesize
120KB

Download
memory/1396-164-0x0000000008120000-0x000000000879A000-memory.dmp

Filesize
6.5MB

Download
memory/1820-173-0x0000000000000000-mapping.dmp

Download
memory/1844-150-0x00000000069E0000-0x00000000069F2000-memory.dmp

Filesize
72KB

Download
memory/1844-148-0x0000000000FA0000-0x000000000102C000-memory.dmp

Filesize
560KB

Download
memory/1844-149-0x0000000005900000-0x0000000005966000-memory.dmp

Filesize
408KB

Download
memory/1844-151-0x0000000006E00000-0x0000000006E3C000-memory.dmp

Filesize
240KB

Download
memory/1844-145-0x0000000000000000-mapping.dmp

Download
memory/1988-171-0x0000000000000000-mapping.dmp

Download
memory/3784-132-0x0000000000000000-mapping.dmp

Download
memory/4128-176-0x0000000000000000-mapping.dmp

Download
memory/4704-172-0x0000000000000000-mapping.dmp

Download
memory/5048-134-0x0000000000000000-mapping.dmp

Download
memory/5056-152-0x0000000000000000-mapping.dmp

Download