Malware Analysis Report

2024-11-15 10:22

Sample ID 241106-c7lexstblg
Target 5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe
SHA256 5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c
Tags
guloader discovery downloader
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

5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c

Threat Level: Known bad

The file 5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe was found to be: Known bad.

Malicious Activity Summary

guloader discovery downloader

Guloader family

Guloader,Cloudeye

Loads dropped DLL

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of SetThreadContext

Program crash

Unsigned PE

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-06 02:43

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-06 02:43

Reported

2024-11-06 02:45

Platform

win7-20240708-en

Max time kernel

149s

Max time network

142s

Command Line

"C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

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\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1504 wrote to memory of 2652 N/A C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe
PID 1504 wrote to memory of 2652 N/A C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe
PID 1504 wrote to memory of 2652 N/A C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe
PID 1504 wrote to memory of 2652 N/A C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe
PID 1504 wrote to memory of 2652 N/A C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe
PID 1504 wrote to memory of 2652 N/A C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe

Processes

C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe

"C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe"

C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe

"C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 jm.ybo13.za.com udp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp
US 72.14.185.43:80 jm.ybo13.za.com tcp

Files

\Users\Admin\AppData\Local\Temp\nsjD6A.tmp\System.dll

MD5 ee260c45e97b62a5e42f17460d406068
SHA1 df35f6300a03c4d3d3bd69752574426296b78695
SHA256 e94a1f7bcd7e0d532b660d0af468eb3321536c3efdca265e61f9ec174b1aef27
SHA512 a98f350d17c9057f33e5847462a87d59cbf2aaeda7f6299b0d49bb455e484ce4660c12d2eb8c4a0d21df523e729222bbd6c820bf25b081bc7478152515b414b3

memory/1504-27-0x0000000003A50000-0x0000000006C7A000-memory.dmp

memory/1504-28-0x0000000077951000-0x0000000077A52000-memory.dmp

memory/1504-29-0x0000000077950000-0x0000000077AF9000-memory.dmp

memory/1504-30-0x0000000003A50000-0x0000000006C7A000-memory.dmp

memory/1504-31-0x0000000003A50000-0x0000000006C7A000-memory.dmp

memory/2652-32-0x0000000000400000-0x0000000001462000-memory.dmp

memory/2652-33-0x0000000000400000-0x0000000001462000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-06 02:43

Reported

2024-11-06 02:45

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

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\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe

"C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe"

C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe

"C:\Users\Admin\AppData\Local\Temp\5afa64f08316e42fe5a53efd3a7354f06f8c654bf7d2c2784dbfef6ad117349c.exe"

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 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 76.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 jm.ybo13.za.com udp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 8.8.8.8:53 44.18.33.45.in-addr.arpa udp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 8.8.8.8:53 212.20.149.52.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
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 45.33.18.44:80 jm.ybo13.za.com tcp
US 45.33.18.44:80 jm.ybo13.za.com tcp

Files

C:\Users\Admin\AppData\Local\Temp\nsx80AA.tmp\System.dll

MD5 ee260c45e97b62a5e42f17460d406068
SHA1 df35f6300a03c4d3d3bd69752574426296b78695
SHA256 e94a1f7bcd7e0d532b660d0af468eb3321536c3efdca265e61f9ec174b1aef27
SHA512 a98f350d17c9057f33e5847462a87d59cbf2aaeda7f6299b0d49bb455e484ce4660c12d2eb8c4a0d21df523e729222bbd6c820bf25b081bc7478152515b414b3

memory/3968-25-0x00000000041F0000-0x000000000741A000-memory.dmp

memory/3968-26-0x00000000777E1000-0x0000000077901000-memory.dmp

memory/3968-27-0x0000000010004000-0x0000000010005000-memory.dmp

memory/3968-28-0x00000000041F0000-0x000000000741A000-memory.dmp

memory/4512-29-0x0000000000400000-0x0000000001654000-memory.dmp

memory/3968-30-0x00000000041F0000-0x000000000741A000-memory.dmp

memory/4512-31-0x0000000000400000-0x0000000001654000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-11-06 02:43

Reported

2024-11-06 02:45

Platform

win7-20240729-en

Max time kernel

16s

Max time network

16s

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 844 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-11-06 02:43

Reported

2024-11-06 02:45

Platform

win10v2004-20241007-en

Max time kernel

135s

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 4292 wrote to memory of 2740 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4292 wrote to memory of 2740 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4292 wrote to memory of 2740 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 408 -p 2740 -ip 2740

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2740 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 136.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 92.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.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
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 10.27.171.150.in-addr.arpa udp

Files

N/A