Malware Analysis Report

2024-09-22 14:55

Sample ID 240618-lmksbsxgna
Target e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89
SHA256 e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89
Tags
gh0strat purplefox persistence rat rootkit trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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

e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89

Threat Level: Known bad

The file e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89 was found to be: Known bad.

Malicious Activity Summary

gh0strat purplefox persistence rat rootkit trojan

Gh0strat

Detect PurpleFox Rootkit

Gh0st RAT payload

PurpleFox

Drops file in Drivers directory

Sets service image path in registry

Loads dropped DLL

Executes dropped EXE

Deletes itself

Drops file in System32 directory

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Runs ping.exe

Modifies data under HKEY_USERS

Suspicious behavior: LoadsDriver

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Analysis: static1

Detonation Overview

Reported

2024-06-18 09:38

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-18 09:38

Reported

2024-06-18 09:41

Platform

win7-20240611-en

Max time kernel

145s

Max time network

148s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe"

Signatures

Detect PurpleFox Rootkit

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

Gh0st RAT payload

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

Gh0strat

rat gh0strat

PurpleFox

rootkit trojan purplefox

Drops file in Drivers directory

Description Indicator Process Target
File created C:\Windows\system32\drivers\QAssist.sys C:\Windows\SysWOW64\sainbox.exe N/A

Sets service image path in registry

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SYSTEM\ControlSet001\services\QAssist\ImagePath = "system32\\DRIVERS\\QAssist.sys" C:\Windows\SysWOW64\sainbox.exe N/A

Deletes itself

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

Executes dropped EXE

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

Loads dropped DLL

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

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\SysWOW64\sainbox.exe C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe N/A
File opened for modification C:\Windows\SysWOW64\sainbox.exe C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe N/A

Modifies data under HKEY_USERS

Description Indicator Process Target
Key created \REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings C:\Windows\SysWOW64\sainbox.exe N/A
Set value (str) \REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Content\CachePrefix C:\Windows\SysWOW64\sainbox.exe N/A
Set value (str) \REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Cookies\CachePrefix = "Cookie:" C:\Windows\SysWOW64\sainbox.exe N/A
Set value (str) \REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\History\CachePrefix = "Visited:" C:\Windows\SysWOW64\sainbox.exe N/A

Runs ping.exe

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\PING.EXE N/A

Suspicious behavior: LoadsDriver

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Windows\SysWOW64\sainbox.exe N/A
Token: 33 N/A C:\Windows\SysWOW64\sainbox.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\SysWOW64\sainbox.exe N/A
Token: 33 N/A C:\Windows\SysWOW64\sainbox.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\SysWOW64\sainbox.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2436 wrote to memory of 2344 N/A C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe C:\Windows\SysWOW64\cmd.exe
PID 2436 wrote to memory of 2344 N/A C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe C:\Windows\SysWOW64\cmd.exe
PID 2436 wrote to memory of 2344 N/A C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe C:\Windows\SysWOW64\cmd.exe
PID 2436 wrote to memory of 2344 N/A C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe C:\Windows\SysWOW64\cmd.exe
PID 2344 wrote to memory of 2100 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\PING.EXE
PID 2344 wrote to memory of 2100 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\PING.EXE
PID 2344 wrote to memory of 2100 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\PING.EXE
PID 2344 wrote to memory of 2100 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\PING.EXE
PID 2232 wrote to memory of 2080 N/A C:\Windows\SysWOW64\sainbox.exe C:\Windows\SysWOW64\sainbox.exe
PID 2232 wrote to memory of 2080 N/A C:\Windows\SysWOW64\sainbox.exe C:\Windows\SysWOW64\sainbox.exe
PID 2232 wrote to memory of 2080 N/A C:\Windows\SysWOW64\sainbox.exe C:\Windows\SysWOW64\sainbox.exe
PID 2232 wrote to memory of 2080 N/A C:\Windows\SysWOW64\sainbox.exe C:\Windows\SysWOW64\sainbox.exe

Processes

C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe

"C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe"

C:\Windows\SysWOW64\sainbox.exe

C:\Windows\SysWOW64\sainbox.exe -auto

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ping -n 2 127.0.0.1 > nul && del C:\Users\Admin\AppData\Local\Temp\E5B364~1.EXE > nul

C:\Windows\SysWOW64\sainbox.exe

C:\Windows\SysWOW64\sainbox.exe -acsi

C:\Windows\SysWOW64\PING.EXE

ping -n 2 127.0.0.1

Network

Country Destination Domain Proto
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
CN 123.99.198.201:22359 sys0316.e1.luyouxia.net tcp
CN 123.99.198.201:22359 sys0316.e1.luyouxia.net tcp
CN 123.99.198.201:22359 sys0316.e1.luyouxia.net tcp
CN 123.99.198.201:22359 sys0316.e1.luyouxia.net tcp
CN 123.99.198.201:22359 sys0316.e1.luyouxia.net tcp
CN 123.99.198.201:22359 sys0316.e1.luyouxia.net tcp
CN 123.99.198.201:22359 sys0316.e1.luyouxia.net tcp

Files

memory/2436-0-0x0000000010000000-0x000000001019F000-memory.dmp

C:\Windows\SysWOW64\sainbox.exe

MD5 4972e410b438253f1cf2712789b456ed
SHA1 78823929302ae341b551f583d7493e9c25a14f29
SHA256 ff104af9ac96af3d9472c02495b55a4a623e32cadb1486b004bb7fd65c093feb
SHA512 e08013dfe5fc9303914922c12de4cda9e90b6995bd96210ad95a75a1c625364f2c9a34bbe4c0d6e37450ec90dbbed762ea2e92cc824169d3c7a3e862b5f52d94

memory/2080-19-0x0000000010000000-0x000000001019F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-18 09:38

Reported

2024-06-18 09:41

Platform

win10v2004-20240508-en

Max time kernel

142s

Max time network

148s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe"

Signatures

Detect PurpleFox Rootkit

rootkit
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

Gh0st RAT payload

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

Gh0strat

rat gh0strat

PurpleFox

rootkit trojan purplefox

Drops file in Drivers directory

Description Indicator Process Target
File created C:\Windows\system32\drivers\QAssist.sys C:\Windows\SysWOW64\sainbox.exe N/A

Sets service image path in registry

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\QAssist\ImagePath = "system32\\DRIVERS\\QAssist.sys" C:\Windows\SysWOW64\sainbox.exe N/A

Executes dropped EXE

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

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\SysWOW64\sainbox.exe C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe N/A
File opened for modification C:\Windows\SysWOW64\sainbox.exe C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe N/A

Modifies data under HKEY_USERS

Description Indicator Process Target
Set value (str) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\History\CachePrefix = "Visited:" C:\Windows\SysWOW64\sainbox.exe N/A
Set value (str) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Content\CachePrefix C:\Windows\SysWOW64\sainbox.exe N/A
Set value (str) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Cookies\CachePrefix = "Cookie:" C:\Windows\SysWOW64\sainbox.exe N/A

Runs ping.exe

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\PING.EXE N/A

Suspicious behavior: LoadsDriver

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Windows\SysWOW64\sainbox.exe N/A
Token: 33 N/A C:\Windows\SysWOW64\sainbox.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\SysWOW64\sainbox.exe N/A
Token: 33 N/A C:\Windows\SysWOW64\sainbox.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\SysWOW64\sainbox.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe

"C:\Users\Admin\AppData\Local\Temp\e5b364a3b2e23376db6e305ebfba77eb615d27a30ebb9e0571da28a476a44c89.exe"

C:\Windows\SysWOW64\sainbox.exe

C:\Windows\SysWOW64\sainbox.exe -auto

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ping -n 2 127.0.0.1 > nul && del C:\Users\Admin\AppData\Local\Temp\E5B364~1.EXE > nul

C:\Windows\SysWOW64\sainbox.exe

C:\Windows\SysWOW64\sainbox.exe -acsi

C:\Windows\SysWOW64\PING.EXE

ping -n 2 127.0.0.1

Network

Country Destination Domain Proto
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp
US 8.8.8.8:53 sys0316.e1.luyouxia.net udp

Files

memory/2156-1-0x0000000010000000-0x000000001019F000-memory.dmp

C:\Windows\SysWOW64\sainbox.exe

MD5 4972e410b438253f1cf2712789b456ed
SHA1 78823929302ae341b551f583d7493e9c25a14f29
SHA256 ff104af9ac96af3d9472c02495b55a4a623e32cadb1486b004bb7fd65c093feb
SHA512 e08013dfe5fc9303914922c12de4cda9e90b6995bd96210ad95a75a1c625364f2c9a34bbe4c0d6e37450ec90dbbed762ea2e92cc824169d3c7a3e862b5f52d94

memory/4440-11-0x0000000010000000-0x000000001019F000-memory.dmp

memory/5780-18-0x0000000010000000-0x000000001019F000-memory.dmp