Malware Analysis Report

2025-01-02 09:43

Sample ID 240905-mcy3msybjj
Target 639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b
SHA256 639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b
Tags
gcleaner discovery loader
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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

639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b

Threat Level: Known bad

The file 639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b was found to be: Known bad.

Malicious Activity Summary

gcleaner discovery loader

GCleaner

Downloads MZ/PE file

Loads dropped DLL

Checks computer location settings

Deletes itself

System Location Discovery: System Language Discovery

Unsigned PE

Enumerates physical storage devices

Program crash

Kills process with taskkill

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-09-05 10:19

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-09-05 10:19

Reported

2024-09-05 10:22

Platform

win7-20240903-en

Max time kernel

117s

Max time network

118s

Command Line

"C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe"

Signatures

GCleaner

loader gcleaner

Downloads MZ/PE file

Deletes itself

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

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\taskkill.exe N/A

Kills process with taskkill

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of AdjustPrivilegeToken

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

Processes

C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe

"C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c taskkill /im "639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe" /f & erase "C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe" & exit

C:\Windows\SysWOW64\taskkill.exe

taskkill /im "639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe" /f

Network

Country Destination Domain Proto
RU 80.66.75.114:80 80.66.75.114 tcp

Files

memory/2096-1-0x0000000000520000-0x0000000000620000-memory.dmp

memory/2096-3-0x0000000000400000-0x0000000000452000-memory.dmp

memory/2096-2-0x0000000000400000-0x000000000043F000-memory.dmp

memory/2096-8-0x0000000010000000-0x000000001001C000-memory.dmp

memory/2096-13-0x0000000000520000-0x0000000000620000-memory.dmp

memory/2096-14-0x0000000000400000-0x000000000043F000-memory.dmp

memory/2096-15-0x0000000000400000-0x0000000000452000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\7CNUR30T\download[1].htm

MD5 cfcd208495d565ef66e7dff9f98764da
SHA1 b6589fc6ab0dc82cf12099d1c2d40ab994e8410c
SHA256 5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9
SHA512 31bca02094eb78126a517b206a88c73cfa9ec6f704c7030d18212cace820f025f00bf0ea68dbf3f3a5436ca63b53bf7bf80ad8d5de7d8359d0b7fed9dbc3ab99

memory/2096-26-0x0000000000400000-0x0000000000452000-memory.dmp

\Users\Admin\AppData\Local\Temp\50MFCYu98TWaU4Vv\Y-Cleaner.exe

MD5 a8cf5621811f7fac55cfe8cb3fa6b9f6
SHA1 121356839e8138a03141f5f5856936a85bd2a474
SHA256 614a0362ab87cee48d0935b5bb957d539be1d94c6fdeb3fe42fac4fbe182c10c
SHA512 4479d951435f222ca7306774002f030972c9f1715d6aaf512fca9420dd79cb6d08240f80129f213851773290254be34f0ff63c7b1f4d554a7db5f84b69e84bdd

memory/2096-36-0x0000000000400000-0x0000000000452000-memory.dmp

memory/2096-38-0x0000000000520000-0x0000000000620000-memory.dmp

memory/2096-37-0x0000000000400000-0x000000000043F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-09-05 10:19

Reported

2024-09-05 10:22

Platform

win10v2004-20240802-en

Max time kernel

91s

Max time network

95s

Command Line

"C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe"

Signatures

GCleaner

loader gcleaner

Downloads MZ/PE file

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-4182098368-2521458979-3782681353-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\taskkill.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A

Kills process with taskkill

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of AdjustPrivilegeToken

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

Processes

C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe

"C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c taskkill /im "639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe" /f & erase "C:\Users\Admin\AppData\Local\Temp\639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe" & exit

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4196 -ip 4196

C:\Windows\SysWOW64\taskkill.exe

taskkill /im "639b2741f024e5d2f78170b472c90762680feaebf2473e24e0bf49b54297c25b.exe" /f

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4196 -s 1588

Network

Country Destination Domain Proto
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
RU 80.66.75.114:80 80.66.75.114 tcp
US 8.8.8.8:53 114.75.66.80.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp

Files

memory/4196-1-0x00000000006B0000-0x00000000007B0000-memory.dmp

memory/4196-2-0x0000000002060000-0x000000000209B000-memory.dmp

memory/4196-3-0x0000000000400000-0x000000000043F000-memory.dmp

memory/4196-8-0x0000000010000000-0x000000001001C000-memory.dmp

memory/4196-13-0x00000000006B0000-0x00000000007B0000-memory.dmp

memory/4196-15-0x0000000000400000-0x0000000000452000-memory.dmp

memory/4196-16-0x0000000002060000-0x000000000209B000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\BOIFDBOU\download[1].htm

MD5 cfcd208495d565ef66e7dff9f98764da
SHA1 b6589fc6ab0dc82cf12099d1c2d40ab994e8410c
SHA256 5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9
SHA512 31bca02094eb78126a517b206a88c73cfa9ec6f704c7030d18212cace820f025f00bf0ea68dbf3f3a5436ca63b53bf7bf80ad8d5de7d8359d0b7fed9dbc3ab99

memory/4196-18-0x0000000000400000-0x000000000043F000-memory.dmp

memory/4196-27-0x0000000000400000-0x0000000000452000-memory.dmp

memory/4196-35-0x0000000000400000-0x0000000000452000-memory.dmp

memory/4196-36-0x0000000000400000-0x000000000043F000-memory.dmp