Malware Analysis Report

2024-12-06 03:02

Sample ID 241119-ckskqaydrb
Target 099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe
SHA256 099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f
Tags
discovery guloader downloader
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

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: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f

Threat Level: Known bad

The file 099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe was found to be: Known bad.

Malicious Activity Summary

discovery guloader downloader

Guloader family

Guloader,Cloudeye

Loads dropped DLL

Suspicious use of SetThreadContext

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of NtCreateThreadExHideFromDebugger

Drops file in Program Files directory

Drops file in Windows directory

Program crash

System Location Discovery: System Language Discovery

Enumerates physical storage devices

Unsigned PE

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-19 02:08

Signatures

Unsigned PE

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

Analysis: behavioral4

Detonation Overview

Submitted

2024-11-19 02:08

Reported

2024-11-19 02:11

Platform

win10v2004-20241007-en

Max time kernel

94s

Max time network

145s

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 4784 wrote to memory of 804 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4784 wrote to memory of 804 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4784 wrote to memory of 804 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 464 -p 804 -ip 804

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 804 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 212.20.149.52.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-19 02:08

Reported

2024-11-19 02:11

Platform

win7-20241023-en

Max time kernel

11s

Max time network

16s

Command Line

"C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe"

Signatures

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Common Files\nomarch\gratiales.ini C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Fonts\Gullis.lnk C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe N/A
File created C:\Windows\Fonts\Gullis.lnk C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.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\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe

"C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe"

Network

N/A

Files

\Users\Admin\AppData\Local\Temp\nstAC76.tmp\System.dll

MD5 75ed96254fbf894e42058062b4b4f0d1
SHA1 996503f1383b49021eb3427bc28d13b5bbd11977
SHA256 a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7
SHA512 58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

C:\Windows\Fonts\Gullis.lnk

MD5 0a0c92e81dd488972878fbbff8a80344
SHA1 1005aa031f106262fe0fa9dcef9e07dbf619764b
SHA256 72eb39d12bb3fe887b58688797a996630ca76cf7d7dc98f94f5c7d99274178eb
SHA512 f111fa6d7a6103b281e79fc3b7340cf1bf50b3471732a209295c884a6c7d6c9f6feafee1ee963ec9719a3b7700b4ec5d3a20511e02ab3b3bd2a0c8514db4074e

memory/2084-20-0x0000000002EB0000-0x0000000005D9A000-memory.dmp

memory/2084-25-0x0000000002EB0000-0x0000000005D9A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-19 02:08

Reported

2024-11-19 02:11

Platform

win10v2004-20241007-en

Max time kernel

140s

Max time network

140s

Command Line

"C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Common Files\nomarch\gratiales.ini C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\Fonts\Gullis.lnk C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe N/A
File opened for modification C:\Windows\Fonts\Gullis.lnk C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.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\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe

"C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe"

C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe

"C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe"

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 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
NL 185.222.57.90:80 185.222.57.90 tcp
US 8.8.8.8:53 90.57.222.185.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp

Files

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

MD5 75ed96254fbf894e42058062b4b4f0d1
SHA1 996503f1383b49021eb3427bc28d13b5bbd11977
SHA256 a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7
SHA512 58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

C:\Windows\Fonts\Gullis.lnk

MD5 38d9f14e829ad52850675937f50106dd
SHA1 a1b5743b2934c9595789120616110255d92800ce
SHA256 fd18cdd6b705886f67c07f34fc631c6bbc60a33b4b1666009f2a2ee3df6e8c7a
SHA512 63e8afe524b13853f3f1f288d58256d0bccca65eab3646c3bace4ca2f8b8ed3fbe7b6f123ce57e5a8bc0875990f6e017b192f21c47f4bd6896f0f0289bd126c6

memory/2876-18-0x0000000002AC0000-0x00000000059AA000-memory.dmp

memory/2876-19-0x0000000077991000-0x0000000077AB1000-memory.dmp

memory/2876-20-0x0000000002AC0000-0x00000000059AA000-memory.dmp

memory/1480-21-0x0000000000400000-0x0000000001654000-memory.dmp

memory/1480-22-0x0000000001660000-0x000000000454A000-memory.dmp

memory/1480-23-0x0000000000400000-0x0000000001654000-memory.dmp

memory/1480-24-0x0000000000400000-0x0000000001654000-memory.dmp

memory/1480-25-0x0000000001660000-0x000000000454A000-memory.dmp

memory/1480-26-0x0000000000400000-0x0000000001654000-memory.dmp

memory/1480-27-0x0000000000400000-0x0000000001654000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-11-19 02:08

Reported

2024-11-19 02:11

Platform

win7-20240903-en

Max time kernel

121s

Max time network

122s

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 352 -s 220

Network

N/A

Files

N/A