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Analysis

max time kernel
136s
max time network
154s
platform
windows11-21h2_x64
resource
win11-20240221-en
resource tags

arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
submitted
02/03/2024, 17:01

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Report Analysis Logs

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

pid	Process
4080	Stpxrq.exe
4868	Stpxrq.exe

Creates a Windows Service
persistence

Drops file in System32 directory 12 IoCs

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

Drops file in Program Files directory 2 IoCs

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

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

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
3712	HEUR-Backdoor.Win32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3712	HEUR-Backdoor.Win32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4080 wrote to memory of 4868	4080	Stpxrq.exe	82
PID 4080 wrote to memory of 4868	4080	Stpxrq.exe	82
PID 4080 wrote to memory of 4868	4080	Stpxrq.exe	82

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:3712

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:4080
- 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:4868

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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