Malware Analysis Report

2024-09-22 14:51

Sample ID 240620-lrvs4a1cjf
Target 3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5
SHA256 3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5
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: 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

3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5

Threat Level: Known bad

The file 3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5 was found to be: Known bad.

Malicious Activity Summary

gh0strat purplefox persistence rat rootkit trojan

PurpleFox

Gh0st RAT payload

Detect PurpleFox Rootkit

Gh0strat

Drops file in Drivers directory

Sets service image path in registry

Loads dropped DLL

Deletes itself

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Suspicious behavior: LoadsDriver

Suspicious use of AdjustPrivilegeToken

Runs ping.exe

Modifies data under HKEY_USERS

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Analysis: static1

Detonation Overview

Reported

2024-06-20 09:46

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-20 09:46

Reported

2024-06-20 09:49

Platform

win10v2004-20240611-en

Max time kernel

145s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.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 opened for modification C:\Windows\SysWOW64\sainbox.exe C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.exe N/A
File created C:\Windows\SysWOW64\sainbox.exe C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.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\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\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.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\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.exe

"C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.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\3730E6~1.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 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 zk2733763848.e2.luyouxia.net udp
US 8.8.8.8:53 g.bing.com udp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
US 13.107.21.237:443 g.bing.com tcp
US 8.8.8.8:53 88.90.14.23.in-addr.arpa udp
US 8.8.8.8:53 64.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 237.21.107.13.in-addr.arpa udp
US 8.8.8.8:53 138.201.86.20.in-addr.arpa udp
US 8.8.8.8:53 183.142.211.20.in-addr.arpa udp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 10.27.171.150.in-addr.arpa udp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp

Files

memory/1844-1-0x0000000010000000-0x000000001019F000-memory.dmp

C:\Windows\SysWOW64\sainbox.exe

MD5 93aef31e912fa9fa0c6423f5eee39b92
SHA1 01743de8f41cedaec95c71d9559624fd537d4dac
SHA256 3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5
SHA512 502c990c9fc0d81526aec775834c852106df585428f9830e983219ea805a8f54013de38c2d741b0765e749165569322662dc66f01555f80c1c35616bb4dfda63

memory/4800-11-0x0000000010000000-0x000000001019F000-memory.dmp

memory/2116-19-0x0000000010000000-0x000000001019F000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-20 09:46

Reported

2024-06-20 09:49

Platform

win7-20240221-en

Max time kernel

145s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.exe"

Signatures

Detect PurpleFox Rootkit

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

Gh0st RAT payload

Description Indicator Process Target
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\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.exe N/A
File opened for modification C:\Windows\SysWOW64\sainbox.exe C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.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\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
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

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\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.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 1800 wrote to memory of 2612 N/A C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.exe C:\Windows\SysWOW64\cmd.exe
PID 1800 wrote to memory of 2612 N/A C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.exe C:\Windows\SysWOW64\cmd.exe
PID 1800 wrote to memory of 2612 N/A C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.exe C:\Windows\SysWOW64\cmd.exe
PID 1800 wrote to memory of 2612 N/A C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.exe C:\Windows\SysWOW64\cmd.exe
PID 1788 wrote to memory of 2036 N/A C:\Windows\SysWOW64\sainbox.exe C:\Windows\SysWOW64\sainbox.exe
PID 1788 wrote to memory of 2036 N/A C:\Windows\SysWOW64\sainbox.exe C:\Windows\SysWOW64\sainbox.exe
PID 1788 wrote to memory of 2036 N/A C:\Windows\SysWOW64\sainbox.exe C:\Windows\SysWOW64\sainbox.exe
PID 1788 wrote to memory of 2036 N/A C:\Windows\SysWOW64\sainbox.exe C:\Windows\SysWOW64\sainbox.exe
PID 2612 wrote to memory of 2652 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\PING.EXE
PID 2612 wrote to memory of 2652 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\PING.EXE
PID 2612 wrote to memory of 2652 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\PING.EXE
PID 2612 wrote to memory of 2652 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\PING.EXE

Processes

C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.exe

"C:\Users\Admin\AppData\Local\Temp\3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5.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\3730E6~1.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 zk2733763848.e2.luyouxia.net udp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp
CN 123.99.198.201:21155 zk2733763848.e2.luyouxia.net tcp

Files

memory/1800-0-0x0000000010000000-0x000000001019F000-memory.dmp

C:\Windows\SysWOW64\sainbox.exe

MD5 93aef31e912fa9fa0c6423f5eee39b92
SHA1 01743de8f41cedaec95c71d9559624fd537d4dac
SHA256 3730e600a60fed05d20e23e9340e37e5f5f072e6d4801150326ff4e2a4fdb4c5
SHA512 502c990c9fc0d81526aec775834c852106df585428f9830e983219ea805a8f54013de38c2d741b0765e749165569322662dc66f01555f80c1c35616bb4dfda63