Malware Analysis Report

2024-11-13 16:48

Sample ID 200714-1wz6vgzdy2
Target DocumentPreview.exe
SHA256 0a6be94628e528a0354c71a800510ab89c442a5f3a428a49b729662d4d19529c
Tags
buer loader persistence
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

0a6be94628e528a0354c71a800510ab89c442a5f3a428a49b729662d4d19529c

Threat Level: Known bad

The file DocumentPreview.exe was found to be: Known bad.

Malicious Activity Summary

buer loader persistence

Modifies WinLogon for persistence

Buer

Buer Loader

Executes dropped EXE

Loads dropped DLL

Deletes itself

Enumerates connected drives

Enumerates physical storage devices

Program crash

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2020-07-14 18:24

Signatures

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2020-07-14 18:24

Reported

2020-07-14 18:26

Platform

win10v200430

Max time kernel

124s

Max time network

126s

Command Line

"C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe"

Signatures

Buer

loader buer

Modifies WinLogon for persistence

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\b6a8e8f24bc6b598ce7d\\gennt.exe\"" C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A

Buer Loader

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A

Deletes itself

Description Indicator Process Target
N/A N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\F: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\I: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\U: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\V: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\Y: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\G: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\O: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\Q: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\X: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\A: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\H: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\J: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\M: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\P: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\R: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\T: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\W: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\B: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\E: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\K: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\L: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\N: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\S: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A
File opened (read-only) \??\Z: C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe N/A

Enumerates physical storage devices

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\secinit.exe

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeRestorePrivilege N/A C:\Windows\SysWOW64\WerFault.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\SysWOW64\WerFault.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WerFault.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2536 wrote to memory of 2652 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe
PID 2536 wrote to memory of 2652 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe
PID 2536 wrote to memory of 2652 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 2676 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 2652 wrote to memory of 3476 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 2652 wrote to memory of 3476 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 2652 wrote to memory of 3476 N/A C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe C:\Windows\SysWOW64\cmd.exe

Processes

C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe

"C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe"

C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe

C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe "C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe" ensgJJ

C:\Windows\SysWOW64\secinit.exe

C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2676 -s 420

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\b6a8e8f24bc6b598ce7d}"

Network

Country Destination Domain Proto
N/A 162.244.81.87:443 tcp
N/A 13.107.4.52:80 www.msftconnecttest.com tcp
N/A 162.244.81.87:443 tcp
N/A 162.244.81.87:443 tcp

Files

memory/2536-0-0x0000000000660000-0x000000000066C000-memory.dmp

memory/2652-1-0x0000000000000000-mapping.dmp

C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe

MD5 801b2019d58f05ea3667603d3f2ff822
SHA1 ce0c63d9c1dd967d68158156e1c88e731fa25447
SHA256 0a6be94628e528a0354c71a800510ab89c442a5f3a428a49b729662d4d19529c
SHA512 8ef21833c493cb7bfad632df1842216dbcf7fa54fd87cb065d8d32fc120635b802e93481128f01d53bb7b5f32fa4d50122b4099f38cc348f9153a3b43be6131a

C:\ProgramData\b6a8e8f24bc6b598ce7d\gennt.exe

MD5 801b2019d58f05ea3667603d3f2ff822
SHA1 ce0c63d9c1dd967d68158156e1c88e731fa25447
SHA256 0a6be94628e528a0354c71a800510ab89c442a5f3a428a49b729662d4d19529c
SHA512 8ef21833c493cb7bfad632df1842216dbcf7fa54fd87cb065d8d32fc120635b802e93481128f01d53bb7b5f32fa4d50122b4099f38cc348f9153a3b43be6131a

memory/2652-4-0x0000000000590000-0x000000000059C000-memory.dmp

memory/2676-5-0x0000000000000000-mapping.dmp

memory/3224-6-0x00000000044F0000-0x00000000044F1000-memory.dmp

memory/2676-7-0x0000000000000000-mapping.dmp

memory/2676-8-0x0000000000000000-mapping.dmp

memory/2676-9-0x0000000000000000-mapping.dmp

memory/2676-10-0x0000000000000000-mapping.dmp

memory/2676-11-0x0000000000000000-mapping.dmp

memory/3224-12-0x0000000004ED0000-0x0000000004ED1000-memory.dmp

memory/3476-13-0x0000000000000000-mapping.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2020-07-14 18:24

Reported

2020-07-14 18:26

Platform

win7

Max time kernel

92s

Max time network

85s

Command Line

"C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe"

Signatures

Buer

loader buer

Modifies WinLogon for persistence

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\12ab6e5e52ff0c5398ba\\gennt.exe\"" C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A

Buer Loader

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A

Deletes itself

Description Indicator Process Target
N/A N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\X: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\E: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\I: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\J: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\M: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\N: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\O: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\Q: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\B: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\H: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\L: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\R: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\U: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\G: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\P: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\V: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\Z: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\A: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\F: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\K: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\S: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\T: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\W: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A
File opened (read-only) \??\Y: C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A

Enumerates physical storage devices

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\secinit.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe N/A
N/A N/A C:\Windows\SysWOW64\WerFault.exe N/A
N/A N/A C:\Windows\SysWOW64\WerFault.exe N/A
N/A N/A C:\Windows\SysWOW64\WerFault.exe N/A
N/A N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WerFault.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1104 wrote to memory of 1832 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe
PID 1104 wrote to memory of 1832 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe
PID 1104 wrote to memory of 1832 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe
PID 1104 wrote to memory of 1832 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1832 wrote to memory of 1240 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1240 wrote to memory of 1808 N/A C:\Windows\SysWOW64\secinit.exe C:\Windows\SysWOW64\WerFault.exe
PID 1240 wrote to memory of 1808 N/A C:\Windows\SysWOW64\secinit.exe C:\Windows\SysWOW64\WerFault.exe
PID 1240 wrote to memory of 1808 N/A C:\Windows\SysWOW64\secinit.exe C:\Windows\SysWOW64\WerFault.exe
PID 1240 wrote to memory of 1808 N/A C:\Windows\SysWOW64\secinit.exe C:\Windows\SysWOW64\WerFault.exe
PID 1832 wrote to memory of 1872 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 1832 wrote to memory of 1872 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 1832 wrote to memory of 1872 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 1832 wrote to memory of 1872 N/A C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe C:\Windows\SysWOW64\cmd.exe

Processes

C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe

"C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe"

C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe

C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe "C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe" ensgJJ

C:\Windows\SysWOW64\secinit.exe

C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1240 -s 144

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\12ab6e5e52ff0c5398ba}"

Network

Country Destination Domain Proto
N/A 162.244.81.87:443 tcp
N/A 162.244.81.87:443 tcp
N/A 162.244.81.87:443 tcp

Files

memory/1104-0-0x0000000000260000-0x000000000026C000-memory.dmp

\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe

MD5 801b2019d58f05ea3667603d3f2ff822
SHA1 ce0c63d9c1dd967d68158156e1c88e731fa25447
SHA256 0a6be94628e528a0354c71a800510ab89c442a5f3a428a49b729662d4d19529c
SHA512 8ef21833c493cb7bfad632df1842216dbcf7fa54fd87cb065d8d32fc120635b802e93481128f01d53bb7b5f32fa4d50122b4099f38cc348f9153a3b43be6131a

memory/1832-2-0x0000000000000000-mapping.dmp

C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe

MD5 801b2019d58f05ea3667603d3f2ff822
SHA1 ce0c63d9c1dd967d68158156e1c88e731fa25447
SHA256 0a6be94628e528a0354c71a800510ab89c442a5f3a428a49b729662d4d19529c
SHA512 8ef21833c493cb7bfad632df1842216dbcf7fa54fd87cb065d8d32fc120635b802e93481128f01d53bb7b5f32fa4d50122b4099f38cc348f9153a3b43be6131a

memory/1832-4-0x0000000000250000-0x000000000025C000-memory.dmp

C:\ProgramData\12ab6e5e52ff0c5398ba\gennt.exe

MD5 801b2019d58f05ea3667603d3f2ff822
SHA1 ce0c63d9c1dd967d68158156e1c88e731fa25447
SHA256 0a6be94628e528a0354c71a800510ab89c442a5f3a428a49b729662d4d19529c
SHA512 8ef21833c493cb7bfad632df1842216dbcf7fa54fd87cb065d8d32fc120635b802e93481128f01d53bb7b5f32fa4d50122b4099f38cc348f9153a3b43be6131a

memory/1240-6-0x0000000000000000-mapping.dmp

memory/1808-7-0x0000000000000000-mapping.dmp

memory/1808-8-0x0000000001FB0000-0x0000000001FC1000-memory.dmp

memory/1240-9-0x0000000000000000-mapping.dmp

memory/1240-10-0x0000000000000000-mapping.dmp

memory/1808-11-0x0000000002600000-0x0000000002611000-memory.dmp

memory/1872-12-0x0000000000000000-mapping.dmp