7559e6ca8b77400f88bf4e67208a1c32570a670068eccae9e3d226cc5471bd47

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18-04-2024 19:05

18-04-2024 16:34

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Analysis

max time kernel
1787s
max time network
1515s
platform
windows11-21h2_x64
resource
win11-20240412-en
resource tags

arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system
submitted
18-04-2024 16:34

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General

Target

bazaar.2020.02/HEUR-Backdoor.Win32.exe
Size

43KB
MD5

f3cbdffbf6bfc26fe09f95e88b188c09
SHA1

e8feb8d7baa1290f591693f068cd6941cb9c878c
SHA256

1c659cbf8f73b2dd0ed8238595c225dbc1e87d5ea538c24a5d52faf0f4a49e7d
SHA512

bac9cc4ebde8e1133d8a332c327dcc72ef83f3457b3048899be3550c7d1c03c8c59d0ab82304def44793ac9fc91a193a018e6fbb256681b5baad366df4e8b3b3
SSDEEP

768:VrgeWGJaj2b2/K6/1CSGIKPlavRzY0nEs3UgLM6KLi0z1xxFopI:ybs4K6dyNPIvRMEEgCnxipI

Score

7^/10

persistence

Malware Config

Signatures

Executes dropped EXE 2 IoCs

Processes:

Stpxrq.exeStpxrq.exe

pid process

1840 Stpxrq.exe
4532 Stpxrq.exe
Creates a Windows Service
persistence

pid	process
1840	Stpxrq.exe
4532	Stpxrq.exe

Drops file in System32 directory 14 IoCs

Processes:

Stpxrq.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CF14D1855652602540DFCFECD21854DB_71F4740D37287A91812B9479338ACF24	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\0DA515F703BB9B49479E8697ADB0B955_786387CC77858B88BA3234B304062475	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\IE	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CF14D1855652602540DFCFECD21854DB_71F4740D37287A91812B9479338ACF24	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCookies	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\History\History.IE5	Stpxrq.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\0DA515F703BB9B49479E8697ADB0B955_786387CC77858B88BA3234B304062475	Stpxrq.exe

Drops file in Program Files directory 2 IoCs

Processes:

HEUR-Backdoor.Win32.exe

description	ioc	process
File created	C:\Program Files (x86)\Microsoft Qizfbz\Stpxrq.exe	HEUR-Backdoor.Win32.exe
File opened for modification	C:\Program Files (x86)\Microsoft Qizfbz\Stpxrq.exe	HEUR-Backdoor.Win32.exe

Modifies data under HKEY_USERS 9 IoCs

Processes:

Stpxrq.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Content\CachePrefix	Stpxrq.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\History\CachePrefix = "Visited:"	Stpxrq.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\	Stpxrq.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect = "0"	Stpxrq.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Cookies\CachePrefix = "Cookie:"	Stpxrq.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ProxyBypass = "1"	Stpxrq.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\IntranetName = "1"	Stpxrq.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	Stpxrq.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	Stpxrq.exe

Suspicious behavior: RenamesItself 1 IoCs

Processes:

HEUR-Backdoor.Win32.exe

pid process

1160 HEUR-Backdoor.Win32.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

HEUR-Backdoor.Win32.exe

description pid process

Token: SeDebugPrivilege 1160 HEUR-Backdoor.Win32.exe

pid	process
1160	HEUR-Backdoor.Win32.exe

description	pid	process
Token: SeDebugPrivilege	1160	HEUR-Backdoor.Win32.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

Stpxrq.exe

description	pid	process	target process
PID 1840 wrote to memory of 4532	1840	Stpxrq.exe	Stpxrq.exe
PID 1840 wrote to memory of 4532	1840	Stpxrq.exe	Stpxrq.exe
PID 1840 wrote to memory of 4532	1840	Stpxrq.exe	Stpxrq.exe

C:\Users\Admin\AppData\Local\Temp\bazaar.2020.02\HEUR-Backdoor.Win32.exe
"C:\Users\Admin\AppData\Local\Temp\bazaar.2020.02\HEUR-Backdoor.Win32.exe"
1⤵
- Drops file in Program Files directory
- Suspicious behavior: RenamesItself
- Suspicious use of AdjustPrivilegeToken
PID:1160

C:\Program Files (x86)\Microsoft Qizfbz\Stpxrq.exe
"C:\Program Files (x86)\Microsoft Qizfbz\Stpxrq.exe"
1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1840

C:\Program Files (x86)\Microsoft Qizfbz\Stpxrq.exe
"C:\Program Files (x86)\Microsoft Qizfbz\Stpxrq.exe" Win7
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:4532

Network

MITRE ATT&CK Matrix

Replay Monitor

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Downloads

C:\Program Files (x86)\Microsoft Qizfbz\Stpxrq.exe
Filesize
43KB

MD5
f3cbdffbf6bfc26fe09f95e88b188c09

SHA1
e8feb8d7baa1290f591693f068cd6941cb9c878c

SHA256
1c659cbf8f73b2dd0ed8238595c225dbc1e87d5ea538c24a5d52faf0f4a49e7d

SHA512
bac9cc4ebde8e1133d8a332c327dcc72ef83f3457b3048899be3550c7d1c03c8c59d0ab82304def44793ac9fc91a193a018e6fbb256681b5baad366df4e8b3b3

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