Malware Analysis Report

2024-11-13 16:48

Sample ID 200708-rkhd2eyrge
Target DocumentPreview.exe
SHA256 e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1
Tags
buer loader persistence
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1

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 behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2020-07-08 15:40

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2020-07-08 15:40

Reported

2020-07-08 15:42

Platform

win7

Max time kernel

149s

Max time network

155s

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\\563b2a5942b492d3dbe0\\gennt.exe\"" C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A

Buer Loader

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A

Deletes itself

Description Indicator Process Target
N/A N/A C:\ProgramData\563b2a5942b492d3dbe0\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) \??\B: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\F: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\G: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\K: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\P: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\S: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\W: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\A: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\H: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\N: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\R: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\T: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\U: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\V: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\X: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\E: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\Y: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\L: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\M: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\O: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\Z: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\I: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\Q: C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe N/A
File opened (read-only) \??\J: C:\ProgramData\563b2a5942b492d3dbe0\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\563b2a5942b492d3dbe0\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 1496 wrote to memory of 1904 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe
PID 1496 wrote to memory of 1904 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe
PID 1496 wrote to memory of 1904 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe
PID 1496 wrote to memory of 1904 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1904 wrote to memory of 1812 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 1812 wrote to memory of 1876 N/A C:\Windows\SysWOW64\secinit.exe C:\Windows\SysWOW64\WerFault.exe
PID 1812 wrote to memory of 1876 N/A C:\Windows\SysWOW64\secinit.exe C:\Windows\SysWOW64\WerFault.exe
PID 1812 wrote to memory of 1876 N/A C:\Windows\SysWOW64\secinit.exe C:\Windows\SysWOW64\WerFault.exe
PID 1812 wrote to memory of 1876 N/A C:\Windows\SysWOW64\secinit.exe C:\Windows\SysWOW64\WerFault.exe
PID 1904 wrote to memory of 1584 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 1904 wrote to memory of 1584 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 1904 wrote to memory of 1584 N/A C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 1904 wrote to memory of 1584 N/A C:\ProgramData\563b2a5942b492d3dbe0\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\563b2a5942b492d3dbe0\gennt.exe

C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe "C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe" ensgJJ

C:\Windows\SysWOW64\secinit.exe

C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 160

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\563b2a5942b492d3dbe0}"

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/1496-0-0x0000000000030000-0x000000000003C000-memory.dmp

\ProgramData\563b2a5942b492d3dbe0\gennt.exe

MD5 db3c2530d727bac602e6c41cb3e60562
SHA1 0d62d5a5fba84c1e826591f27892466a1cd59257
SHA256 e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1
SHA512 03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8

memory/1904-2-0x0000000000000000-mapping.dmp

C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe

MD5 db3c2530d727bac602e6c41cb3e60562
SHA1 0d62d5a5fba84c1e826591f27892466a1cd59257
SHA256 e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1
SHA512 03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8

C:\ProgramData\563b2a5942b492d3dbe0\gennt.exe

MD5 db3c2530d727bac602e6c41cb3e60562
SHA1 0d62d5a5fba84c1e826591f27892466a1cd59257
SHA256 e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1
SHA512 03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8

memory/1812-6-0x0000000000000000-mapping.dmp

memory/1876-7-0x0000000000000000-mapping.dmp

memory/1876-8-0x0000000001D30000-0x0000000001D41000-memory.dmp

memory/1812-9-0x0000000000000000-mapping.dmp

memory/1812-10-0x0000000000000000-mapping.dmp

memory/1876-11-0x00000000024E0000-0x00000000024F1000-memory.dmp

memory/1584-12-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2020-07-08 15:40

Reported

2020-07-08 15:42

Platform

win10v200430

Max time kernel

138s

Max time network

143s

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\\ae99cb89d6941a0b3431\\gennt.exe\"" C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A

Buer Loader

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A

Deletes itself

Description Indicator Process Target
N/A N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\N: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\U: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\V: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\A: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\G: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\I: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\J: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\M: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\X: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\B: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\K: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\S: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\T: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\W: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\H: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\O: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\P: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\Y: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\Z: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\E: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\F: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\L: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\Q: C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe N/A
File opened (read-only) \??\R: C:\ProgramData\ae99cb89d6941a0b3431\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 2904 wrote to memory of 3720 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe
PID 2904 wrote to memory of 3720 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe
PID 2904 wrote to memory of 3720 N/A C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 4000 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\secinit.exe
PID 3720 wrote to memory of 3740 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 3720 wrote to memory of 3740 N/A C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe C:\Windows\SysWOW64\cmd.exe
PID 3720 wrote to memory of 3740 N/A C:\ProgramData\ae99cb89d6941a0b3431\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\ae99cb89d6941a0b3431\gennt.exe

C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe "C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe" ensgJJ

C:\Windows\SysWOW64\secinit.exe

C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4000 -s 352

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\ae99cb89d6941a0b3431}"

Network

Country Destination Domain Proto
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
N/A 162.244.81.87:443 tcp

Files

memory/2904-0-0x00000000001D0000-0x00000000001DC000-memory.dmp

memory/3720-1-0x0000000000000000-mapping.dmp

C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe

MD5 db3c2530d727bac602e6c41cb3e60562
SHA1 0d62d5a5fba84c1e826591f27892466a1cd59257
SHA256 e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1
SHA512 03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8

C:\ProgramData\ae99cb89d6941a0b3431\gennt.exe

MD5 db3c2530d727bac602e6c41cb3e60562
SHA1 0d62d5a5fba84c1e826591f27892466a1cd59257
SHA256 e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1
SHA512 03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8

memory/4000-5-0x0000000000000000-mapping.dmp

memory/3912-6-0x00000000043C0000-0x00000000043C1000-memory.dmp

memory/4000-8-0x0000000000000000-mapping.dmp

memory/4000-7-0x0000000000000000-mapping.dmp

memory/4000-10-0x0000000000000000-mapping.dmp

memory/4000-9-0x0000000000000000-mapping.dmp

memory/4000-11-0x0000000000000000-mapping.dmp

memory/3912-12-0x0000000004C30000-0x0000000004C31000-memory.dmp

memory/3740-13-0x0000000000000000-mapping.dmp