Malware Analysis Report

2025-03-15 03:48

Sample ID 250224-l7zrzswn17
Target trx40.zip
SHA256 c7fc7b8e258d4838544c2b70f292e37d1e9a9ad6ae74c8d8bd167d9d2392f636
Tags
fatalrat discovery infostealer rat stealer 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: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral4

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

c7fc7b8e258d4838544c2b70f292e37d1e9a9ad6ae74c8d8bd167d9d2392f636

Threat Level: Known bad

The file trx40.zip was found to be: Known bad.

Malicious Activity Summary

fatalrat discovery infostealer rat stealer trojan

FatalRat

Fatalrat family

Fatal Rat payload

Enumerates connected drives

Program crash

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

Checks processor information in registry

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-02-24 10:11

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-02-24 10:11

Reported

2025-02-24 10:13

Platform

win7-20241010-en

Max time kernel

136s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe"

Signatures

FatalRat

stealer trojan fatalrat

Fatalrat family

fatalrat

Fatal Rat payload

rat infostealer
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\I: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\L: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\Y: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\M: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\P: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\Q: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\R: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\S: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\T: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\U: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\V: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\J: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\N: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\O: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\X: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\Z: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\B: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\G: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\H: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\K: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\W: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\E: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A

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\package\MaskDoc.exe N/A

Checks processor information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe

"C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 hm.weilay.com.cn udp
HK 43.132.244.128:8081 tcp
US 8.8.8.8:53 hm.weilay.com.cn udp
HK 47.239.83.12:1527 hm.weilay.com.cn tcp
HK 43.132.244.128:8081 tcp
HK 43.132.244.128:8081 tcp
HK 43.132.244.128:8081 tcp
HK 43.132.244.128:8081 tcp

Files

memory/2220-1-0x0000000001DA0000-0x0000000001DDB000-memory.dmp

memory/2220-2-0x0000000001E80000-0x0000000001EB2000-memory.dmp

memory/2220-3-0x00000000003D0000-0x00000000003FA000-memory.dmp

memory/2220-8-0x0000000001DA0000-0x0000000001DDB000-memory.dmp

memory/2220-9-0x0000000001E80000-0x0000000001EB2000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-02-24 10:11

Reported

2025-02-24 10:13

Platform

win10v2004-20250217-en

Max time kernel

148s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe"

Signatures

FatalRat

stealer trojan fatalrat

Fatalrat family

fatalrat

Fatal Rat payload

rat infostealer
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\R: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\U: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\V: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\B: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\I: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\K: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\P: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\S: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\Y: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\G: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\J: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\M: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\N: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\Q: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\T: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\X: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\Z: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\L: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\O: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\W: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\E: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
File opened (read-only) \??\H: C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A

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\package\MaskDoc.exe N/A

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe

"C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe"

Network

Country Destination Domain Proto
US 150.171.27.10:443 tcp
US 150.171.27.10:443 tcp
US 150.171.27.10:443 tcp
US 8.8.8.8:53 hm.weilay.com.cn udp
US 8.8.8.8:53 hm.weilay.com.cn udp
HK 43.132.244.128:8081 tcp
HK 47.239.83.12:1527 hm.weilay.com.cn tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
HK 43.132.244.128:8081 tcp
HK 43.132.244.128:8081 tcp
HK 43.132.244.128:8081 tcp
HK 43.132.244.128:8081 tcp

Files

memory/4128-1-0x0000000002AD0000-0x0000000002B02000-memory.dmp

memory/4128-2-0x0000000002B10000-0x0000000002B4B000-memory.dmp

memory/4128-3-0x0000000000600000-0x000000000062A000-memory.dmp

memory/4128-8-0x0000000002AD0000-0x0000000002B02000-memory.dmp

memory/4128-9-0x0000000002B10000-0x0000000002B4B000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2025-02-24 10:11

Reported

2025-02-24 10:13

Platform

win7-20240903-en

Max time kernel

118s

Max time network

119s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1

Signatures

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2688 -s 352

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2025-02-24 10:11

Reported

2025-02-24 10:13

Platform

win10v2004-20250217-en

Max time kernel

149s

Max time network

149s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1

Signatures

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1904 wrote to memory of 1704 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1904 wrote to memory of 1704 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1904 wrote to memory of 1704 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 1704 -ip 1704

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1704 -s 896

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 udp

Files

N/A