Malware Analysis Report

2025-04-03 14:27

Sample ID 241217-d2krwazpbp
Target 81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe
SHA256 81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478
Tags
discovery agenttesla guloader downloader keylogger spyware stealer trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral6

Detonation Overview

Command Line

Signatures

Processes

Network

Files

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: behavioral5

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478

Threat Level: Known bad

The file 81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe was found to be: Known bad.

Malicious Activity Summary

discovery agenttesla guloader downloader keylogger spyware stealer trojan

AgentTesla

Guloader family

Agenttesla family

Guloader,Cloudeye

Reads data files stored by FTP clients

Loads dropped DLL

Reads WinSCP keys stored on the system

Reads user/profile data of local email clients

Reads user/profile data of web browsers

Looks up external IP address via web service

Suspicious use of SetThreadContext

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of NtCreateThreadExHideFromDebugger

Unsigned PE

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Program crash

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-17 03:30

Signatures

Unsigned PE

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

Analysis: behavioral6

Detonation Overview

Submitted

2024-12-17 03:30

Reported

2024-12-17 03:32

Platform

win10v2004-20241007-en

Max time kernel

148s

Max time network

149s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.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 2420 wrote to memory of 416 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2420 wrote to memory of 416 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2420 wrote to memory of 416 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\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 416 -ip 416

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 416 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 68.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 182.129.81.91.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-12-17 03:30

Reported

2024-12-17 03:32

Platform

win7-20241010-en

Max time kernel

147s

Max time network

69s

Command Line

"C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe"

Signatures

AgentTesla

keylogger trojan stealer spyware agenttesla

Agenttesla family

agenttesla

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Reads WinSCP keys stored on the system

spyware stealer

Reads data files stored by FTP clients

spyware stealer

Reads user/profile data of local email clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Looks up external IP address via web service

Description Indicator Process Target
N/A api.ipify.org N/A N/A
N/A api.ipify.org N/A N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.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\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2592 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe
PID 2592 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe
PID 2592 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe
PID 2592 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe
PID 2592 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe
PID 2592 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe

Processes

C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe

"C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe"

C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe

"C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe"

Network

Country Destination Domain Proto
NL 84.38.133.133:80 84.38.133.133 tcp
US 8.8.8.8:53 api.ipify.org udp
US 104.26.13.205:443 api.ipify.org tcp

Files

\Users\Admin\AppData\Local\Temp\nsuDE11.tmp\System.dll

MD5 0ff2d70cfdc8095ea99ca2dabbec3cd7
SHA1 10c51496d37cecd0e8a503a5a9bb2329d9b38116
SHA256 982c5fb7ada7d8c9bc3e419d1c35da6f05bc5dd845940c179af3a33d00a36a8b
SHA512 cb5fc0b3194f469b833c2c9abf493fcec5251e8609881b7f5e095b9bd09ed468168e95dda0ba415a7d8d6b7f0dee735467c0ed8e52b223eb5359986891ba6e2e

\Users\Admin\AppData\Local\Temp\nsuDE11.tmp\LangDLL.dll

MD5 174708997758321cf926b69318c6c3f5
SHA1 645488089bf320f6864e0d0bc284c85216e56fbd
SHA256 f577b66492e97c7b8bf515398d8deb745abafd74f56fc03e67fce248ebbeb873
SHA512 214433597e04ca1ff9b4fe092d5d2997707a7c56f0f82c85d586088a200e4455028f3b9427d87b4f06f9252557d5be4b7a9138ea6a8d045df6209421fd8ca054

memory/2592-33-0x00000000030D0000-0x00000000042DA000-memory.dmp

memory/2592-34-0x00000000030D0000-0x00000000042DA000-memory.dmp

memory/2592-35-0x00000000772F1000-0x00000000773F2000-memory.dmp

memory/2592-36-0x00000000772F0000-0x0000000077499000-memory.dmp

memory/2620-37-0x00000000772F0000-0x0000000077499000-memory.dmp

memory/2592-38-0x00000000030D0000-0x00000000042DA000-memory.dmp

memory/2620-39-0x00000000004B0000-0x0000000001512000-memory.dmp

memory/2620-40-0x00000000004B0000-0x00000000004F2000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-17 03:30

Reported

2024-12-17 03:32

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe"

Signatures

AgentTesla

keylogger trojan stealer spyware agenttesla

Agenttesla family

agenttesla

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Reads WinSCP keys stored on the system

spyware stealer

Reads data files stored by FTP clients

spyware stealer

Reads user/profile data of local email clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Looks up external IP address via web service

Description Indicator Process Target
N/A api.ipify.org N/A N/A
N/A api.ipify.org N/A N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.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\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe

"C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe"

C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe

"C:\Users\Admin\AppData\Local\Temp\81c7f5b291b1fcd6d64f7f12208b0134a8462f156dbda97188ec0ba5ff869478.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 22.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
NL 84.38.133.133:80 84.38.133.133 tcp
US 8.8.8.8:53 133.133.38.84.in-addr.arpa udp
US 8.8.8.8:53 api.ipify.org udp
US 172.67.74.152:443 api.ipify.org tcp
US 8.8.8.8:53 152.74.67.172.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 56.163.245.4.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 107.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 86.49.80.91.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 udp

Files

C:\Users\Admin\AppData\Local\Temp\nsl87EE.tmp\System.dll

MD5 0ff2d70cfdc8095ea99ca2dabbec3cd7
SHA1 10c51496d37cecd0e8a503a5a9bb2329d9b38116
SHA256 982c5fb7ada7d8c9bc3e419d1c35da6f05bc5dd845940c179af3a33d00a36a8b
SHA512 cb5fc0b3194f469b833c2c9abf493fcec5251e8609881b7f5e095b9bd09ed468168e95dda0ba415a7d8d6b7f0dee735467c0ed8e52b223eb5359986891ba6e2e

C:\Users\Admin\AppData\Local\Temp\nsl87EE.tmp\LangDLL.dll

MD5 174708997758321cf926b69318c6c3f5
SHA1 645488089bf320f6864e0d0bc284c85216e56fbd
SHA256 f577b66492e97c7b8bf515398d8deb745abafd74f56fc03e67fce248ebbeb873
SHA512 214433597e04ca1ff9b4fe092d5d2997707a7c56f0f82c85d586088a200e4455028f3b9427d87b4f06f9252557d5be4b7a9138ea6a8d045df6209421fd8ca054

memory/3776-35-0x0000000004240000-0x000000000544A000-memory.dmp

memory/3776-36-0x0000000077C21000-0x0000000077D41000-memory.dmp

memory/3776-38-0x0000000010004000-0x0000000010005000-memory.dmp

memory/3776-37-0x0000000004240000-0x000000000544A000-memory.dmp

memory/3776-39-0x0000000004240000-0x000000000544A000-memory.dmp

memory/3928-40-0x0000000001710000-0x000000000291A000-memory.dmp

memory/3928-41-0x0000000077CA8000-0x0000000077CA9000-memory.dmp

memory/3928-42-0x0000000001710000-0x000000000291A000-memory.dmp

memory/3928-43-0x0000000077CC5000-0x0000000077CC6000-memory.dmp

memory/3928-45-0x0000000077C21000-0x0000000077D41000-memory.dmp

memory/3928-44-0x00000000004B0000-0x0000000001704000-memory.dmp

memory/3928-46-0x00000000004B0000-0x00000000004F2000-memory.dmp

memory/3928-47-0x0000000035250000-0x00000000357F4000-memory.dmp

memory/3928-48-0x0000000035800000-0x0000000035866000-memory.dmp

memory/3928-50-0x0000000036170000-0x00000000361C0000-memory.dmp

memory/3928-51-0x00000000361C0000-0x0000000036252000-memory.dmp

memory/3928-52-0x0000000036290000-0x000000003629A000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-12-17 03:30

Reported

2024-12-17 03:32

Platform

win7-20240903-en

Max time kernel

122s

Max time network

123s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\LangDLL.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\$PLUGINSDIR\LangDLL.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\LangDLL.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2664 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-12-17 03:30

Reported

2024-12-17 03:32

Platform

win10v2004-20241007-en

Max time kernel

95s

Max time network

148s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\LangDLL.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 4272 wrote to memory of 1924 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4272 wrote to memory of 1924 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4272 wrote to memory of 1924 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\$PLUGINSDIR\LangDLL.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\LangDLL.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1924 -ip 1924

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1924 -s 608

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 134.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral5

Detonation Overview

Submitted

2024-12-17 03:30

Reported

2024-12-17 03:32

Platform

win7-20240903-en

Max time kernel

121s

Max time network

121s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.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\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1944 -s 224

Network

N/A

Files

N/A