Malware Analysis Report

2024-11-15 10:21

Sample ID 241106-r6y2ys1ncy
Target 5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe
SHA256 5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0
Tags
discovery guloader downloader
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral4

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 Overview

score
10/10

SHA256

5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0

Threat Level: Known bad

The file 5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe was found to be: Known bad.

Malicious Activity Summary

discovery guloader downloader

Guloader family

Guloader,Cloudeye

Loads dropped DLL

Drops file in Windows directory

Drops file in Program Files directory

Unsigned PE

Program crash

System Location Discovery: System Language Discovery

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-06 14:48

Signatures

Unsigned PE

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

Analysis: behavioral3

Detonation Overview

Submitted

2024-11-06 14:48

Reported

2024-11-06 14:51

Platform

win7-20241010-en

Max time kernel

14s

Max time network

18s

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 2384 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-11-06 14:48

Reported

2024-11-06 14:51

Platform

win10v2004-20241007-en

Max time kernel

148s

Max time network

150s

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 3136 wrote to memory of 4368 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3136 wrote to memory of 4368 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3136 wrote to memory of 4368 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 424 -p 4368 -ip 4368

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4368 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 73.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-06 14:48

Reported

2024-11-06 14:51

Platform

win7-20240708-en

Max time kernel

122s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe"

Signatures

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Common Files\customization.rom C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\resources\primy.ini C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.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\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe

"C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe"

Network

N/A

Files

C:\Windows\Resources\primy.ini

MD5 76d9175a3db7407eb0bfc3c07ddcd9d2
SHA1 72071127e9a44935cb02650ed715ccaf6a8f8418
SHA256 1f7119996dd17af05bf05e497104715bbbc3909676afa4329fbd59502be1a1a5
SHA512 5032dab71e70a4bd1dad2f5cf9380e0097be7993bc46886fed6e4bdd8781f2b10d31338d90d0dc5804665bda2cbfe93f1172250e1a8ab7c9118baf9f156e3c69

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

MD5 192639861e3dc2dc5c08bb8f8c7260d5
SHA1 58d30e460609e22fa0098bc27d928b689ef9af78
SHA256 23d618a0293c78ce00f7c6e6dd8b8923621da7dd1f63a070163ef4c0ec3033d6
SHA512 6e573d8b2ef6ed719e271fd0b2fd9cd451f61fc9a9459330108d6d7a65a0f64016303318cad787aa1d5334ba670d8f1c7c13074e1be550b4a316963ecc465cdc

memory/2388-23239-0x0000000003130000-0x0000000003B99000-memory.dmp

memory/2388-23242-0x0000000003130000-0x0000000003B99000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-06 14:48

Reported

2024-11-06 14:51

Platform

win10v2004-20241007-en

Max time kernel

10s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Common Files\customization.rom C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\resources\primy.ini C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.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\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe

"C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe"

C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe

"C:\Users\Admin\AppData\Local\Temp\5fb792bb1793ff9314b4a3a4d3f8e267f9b833ae9467b42f0bd7df012de5d0f0.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 136.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 241.42.69.40.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 kmsaksesuar.com udp
US 44.28.239.165:443 kmsaksesuar.com tcp
US 44.28.239.165:443 kmsaksesuar.com tcp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
US 44.28.239.165:443 kmsaksesuar.com tcp
US 44.28.239.165:443 kmsaksesuar.com tcp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 44.28.239.165:443 kmsaksesuar.com tcp
US 44.28.239.165:443 kmsaksesuar.com tcp
US 44.28.239.165:443 kmsaksesuar.com tcp
US 44.28.239.165:443 kmsaksesuar.com tcp

Files

C:\Windows\Resources\primy.ini

MD5 76d9175a3db7407eb0bfc3c07ddcd9d2
SHA1 72071127e9a44935cb02650ed715ccaf6a8f8418
SHA256 1f7119996dd17af05bf05e497104715bbbc3909676afa4329fbd59502be1a1a5
SHA512 5032dab71e70a4bd1dad2f5cf9380e0097be7993bc46886fed6e4bdd8781f2b10d31338d90d0dc5804665bda2cbfe93f1172250e1a8ab7c9118baf9f156e3c69

C:\Users\Admin\AppData\Local\Temp\nscE3E9.tmp\System.dll

MD5 192639861e3dc2dc5c08bb8f8c7260d5
SHA1 58d30e460609e22fa0098bc27d928b689ef9af78
SHA256 23d618a0293c78ce00f7c6e6dd8b8923621da7dd1f63a070163ef4c0ec3033d6
SHA512 6e573d8b2ef6ed719e271fd0b2fd9cd451f61fc9a9459330108d6d7a65a0f64016303318cad787aa1d5334ba670d8f1c7c13074e1be550b4a316963ecc465cdc

memory/4648-23237-0x0000000002F20000-0x0000000003989000-memory.dmp

memory/4648-23238-0x00000000772A1000-0x00000000773C1000-memory.dmp

memory/4648-23239-0x0000000073F95000-0x0000000073F96000-memory.dmp

memory/4648-23240-0x0000000002F20000-0x0000000003989000-memory.dmp

memory/2592-23241-0x0000000000400000-0x0000000001654000-memory.dmp

memory/2592-23242-0x0000000001660000-0x00000000020C9000-memory.dmp

memory/2592-23243-0x0000000077328000-0x0000000077329000-memory.dmp

memory/2592-23244-0x0000000077345000-0x0000000077346000-memory.dmp

memory/2592-23245-0x0000000001660000-0x00000000020C9000-memory.dmp

memory/2592-23246-0x0000000000400000-0x0000000001654000-memory.dmp

memory/2592-23247-0x00000000772A1000-0x00000000773C1000-memory.dmp