Malware Analysis Report

2025-01-02 11:09

Sample ID 240307-pazmhaaf85
Target b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0
SHA256 b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0
Tags
smokeloader pub1 backdoor trojan
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

b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0

Threat Level: Known bad

The file b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0 was found to be: Known bad.

Malicious Activity Summary

smokeloader pub1 backdoor trojan

SmokeLoader

Deletes itself

Executes dropped EXE

Unsigned PE

Suspicious use of FindShellTrayWindow

Suspicious use of WriteProcessMemory

Suspicious behavior: MapViewOfSection

Uses Task Scheduler COM API

Modifies registry class

Suspicious use of SendNotifyMessage

Suspicious use of AdjustPrivilegeToken

Checks SCSI registry key(s)

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-03-07 12:08

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-07 12:08

Reported

2024-03-07 12:10

Platform

win7-20240221-en

Max time kernel

150s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe"

Signatures

SmokeLoader

trojan backdoor smokeloader

Deletes itself

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\jsvdgtc N/A

Checks SCSI registry key(s)

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Roaming\jsvdgtc N/A
Key queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Roaming\jsvdgtc N/A
Key enumerated \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Roaming\jsvdgtc N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
Key queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
Key enumerated \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\jsvdgtc N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1924 wrote to memory of 1968 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\jsvdgtc
PID 1924 wrote to memory of 1968 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\jsvdgtc
PID 1924 wrote to memory of 1968 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\jsvdgtc
PID 1924 wrote to memory of 1968 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\jsvdgtc

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe

"C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe"

C:\Windows\system32\taskeng.exe

taskeng.exe {1D851EDE-6658-408B-A2C5-518C677FAF7A} S-1-5-21-406356229-2805545415-1236085040-1000:IKJSPGIM\Admin:Interactive:[1]

C:\Users\Admin\AppData\Roaming\jsvdgtc

C:\Users\Admin\AppData\Roaming\jsvdgtc

Network

Country Destination Domain Proto
US 8.8.8.8:53 gxutc2c.com udp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp
PE 190.187.52.42:80 gxutc2c.com tcp

Files

memory/2208-2-0x00000000003A0000-0x00000000003AB000-memory.dmp

memory/2208-3-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2208-1-0x0000000000230000-0x0000000000330000-memory.dmp

memory/2208-5-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1288-4-0x0000000002C00000-0x0000000002C16000-memory.dmp

C:\Users\Admin\AppData\Roaming\jsvdgtc

MD5 d0936de24510643fa68b2d3879ad79d9
SHA1 b9f5bf48d34dfae63e695bfd90efad0a8137ede9
SHA256 b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0
SHA512 4cf4dbfad11b4e9ac58243670027e6387d47bb74544777fedbe57c3e2e1373ca9fcf6727087bc1ae3c3d898e890e11f425b2b06cb611a205b8bc3c5bb89c1480

memory/1968-14-0x00000000005A0000-0x00000000006A0000-memory.dmp

memory/1968-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1968-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1288-16-0x0000000002D30000-0x0000000002D46000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-07 12:08

Reported

2024-03-07 12:10

Platform

win10v2004-20240226-en

Max time kernel

150s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe"

Signatures

SmokeLoader

trojan backdoor smokeloader

Deletes itself

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\ftvaeug N/A

Checks SCSI registry key(s)

Description Indicator Process Target
Key enumerated \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Roaming\ftvaeug N/A
Key queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Roaming\ftvaeug N/A
Key enumerated \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Roaming\ftvaeug N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
Key queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance\ N/A N/A
Key created \REGISTRY\USER\S-1-5-21-275798769-4264537674-1142822080-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\ N/A N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\ N/A N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\ftvaeug N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeShutdownPrivilege N/A N/A N/A
Token: SeCreatePagefilePrivilege N/A N/A N/A
Token: SeShutdownPrivilege N/A N/A N/A
Token: SeCreatePagefilePrivilege N/A N/A N/A
Token: SeShutdownPrivilege N/A N/A N/A
Token: SeCreatePagefilePrivilege N/A N/A N/A
Token: SeShutdownPrivilege N/A N/A N/A
Token: SeCreatePagefilePrivilege N/A N/A N/A
Token: SeManageVolumePrivilege N/A C:\Windows\System32\svchost.exe N/A
Token: SeShutdownPrivilege N/A N/A N/A
Token: SeCreatePagefilePrivilege N/A N/A N/A
Token: SeShutdownPrivilege N/A N/A N/A
Token: SeCreatePagefilePrivilege N/A N/A N/A
Token: SeShutdownPrivilege N/A N/A N/A
Token: SeCreatePagefilePrivilege N/A N/A N/A
Token: SeShutdownPrivilege N/A N/A N/A
Token: SeCreatePagefilePrivilege N/A N/A N/A
Token: SeShutdownPrivilege N/A N/A N/A
Token: SeCreatePagefilePrivilege N/A N/A N/A

Suspicious use of FindShellTrayWindow

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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe

"C:\Users\Admin\AppData\Local\Temp\b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0.exe"

C:\Users\Admin\AppData\Roaming\ftvaeug

C:\Users\Admin\AppData\Roaming\ftvaeug

C:\Windows\system32\rundll32.exe

"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe

C:\Windows\System32\svchost.exe

C:\Windows\System32\svchost.exe -k UnistackSvcGroup

Network

Country Destination Domain Proto
US 8.8.8.8:53 0.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 133.113.22.20.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 gxutc2c.com udp
KR 211.53.230.67:80 gxutc2c.com tcp
US 8.8.8.8:53 67.230.53.211.in-addr.arpa udp
KR 211.53.230.67:80 gxutc2c.com tcp
KR 211.53.230.67:80 gxutc2c.com tcp
KR 211.53.230.67:80 gxutc2c.com tcp
KR 211.53.230.67:80 gxutc2c.com tcp
US 8.8.8.8:53 100.5.17.2.in-addr.arpa udp
KR 211.53.230.67:80 gxutc2c.com tcp
KR 211.53.230.67:80 gxutc2c.com tcp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
KR 211.53.230.67:80 gxutc2c.com tcp
KR 211.53.230.67:80 gxutc2c.com tcp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
KR 211.53.230.67:80 gxutc2c.com tcp
KR 211.53.230.67:80 gxutc2c.com tcp
US 8.8.8.8:53 205.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
KR 211.53.230.67:80 gxutc2c.com tcp
US 8.8.8.8:53 42.134.221.88.in-addr.arpa udp
KR 211.53.230.67:80 gxutc2c.com tcp
KR 211.53.230.67:80 gxutc2c.com tcp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 59.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 udp

Files

memory/2348-1-0x0000000000570000-0x0000000000670000-memory.dmp

memory/2348-2-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2348-3-0x0000000000520000-0x000000000052B000-memory.dmp

memory/3512-4-0x00000000023C0000-0x00000000023D6000-memory.dmp

memory/2348-5-0x0000000000400000-0x0000000000438000-memory.dmp

C:\Users\Admin\AppData\Roaming\ftvaeug

MD5 d0936de24510643fa68b2d3879ad79d9
SHA1 b9f5bf48d34dfae63e695bfd90efad0a8137ede9
SHA256 b8b2ae812b47196a7be9ec41d6186eeaf28f2924b906299995db446be091d5e0
SHA512 4cf4dbfad11b4e9ac58243670027e6387d47bb74544777fedbe57c3e2e1373ca9fcf6727087bc1ae3c3d898e890e11f425b2b06cb611a205b8bc3c5bb89c1480

memory/816-14-0x0000000000470000-0x0000000000570000-memory.dmp

memory/816-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3512-16-0x0000000002420000-0x0000000002436000-memory.dmp

memory/816-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1928-20-0x0000028EBD350000-0x0000028EBD360000-memory.dmp

memory/1928-36-0x0000028EBD450000-0x0000028EBD460000-memory.dmp

memory/1928-52-0x0000028EC57C0000-0x0000028EC57C1000-memory.dmp

memory/1928-54-0x0000028EC57F0000-0x0000028EC57F1000-memory.dmp

memory/1928-55-0x0000028EC57F0000-0x0000028EC57F1000-memory.dmp

memory/1928-56-0x0000028EC5900000-0x0000028EC5901000-memory.dmp