Malware Analysis Report

2024-11-13 17:39

Sample ID 241107-rsw1fatjd1
Target f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb
SHA256 f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb
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

f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb

Threat Level: Known bad

The file f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb was found to be: Known bad.

Malicious Activity Summary

discovery guloader downloader

Guloader,Cloudeye

Guloader family

Loads dropped DLL

Drops file in Windows directory

Drops file in Program Files directory

Program crash

System Location Discovery: System Language Discovery

Enumerates physical storage devices

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-07 14:27

Signatures

Unsigned PE

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

Analysis: behavioral3

Detonation Overview

Submitted

2024-11-07 14:27

Reported

2024-11-07 14:30

Platform

win7-20240708-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 3052 -s 220

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-11-07 14:27

Reported

2024-11-07 14:30

Platform

win10v2004-20241007-en

Max time kernel

93s

Max time network

147s

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 1052 wrote to memory of 1248 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1052 wrote to memory of 1248 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1052 wrote to memory of 1248 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 1248 -ip 1248

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1248 -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 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 71.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 98.117.19.2.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-07 14:27

Reported

2024-11-07 14:30

Platform

win7-20241010-en

Max time kernel

10s

Max time network

19s

Command Line

"C:\Users\Admin\AppData\Local\Temp\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.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\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.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\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.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\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.exe

"C:\Users\Admin\AppData\Local\Temp\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.exe"

Network

N/A

Files

C:\Windows\Resources\primy.ini

MD5 d41d8cd98f00b204e9800998ecf8427e
SHA1 da39a3ee5e6b4b0d3255bfef95601890afd80709
SHA256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
SHA512 cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

\Users\Admin\AppData\Local\Temp\nsu733.tmp\System.dll

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

memory/2248-23239-0x0000000002BA0000-0x0000000003955000-memory.dmp

memory/2248-23240-0x0000000002BA0000-0x0000000003955000-memory.dmp

memory/2248-23243-0x0000000002BA0000-0x0000000003955000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-07 14:27

Reported

2024-11-07 14:30

Platform

win10v2004-20241007-en

Max time kernel

13s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.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\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.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\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.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\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.exe

"C:\Users\Admin\AppData\Local\Temp\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.exe"

C:\Users\Admin\AppData\Local\Temp\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.exe

"C:\Users\Admin\AppData\Local\Temp\f392bfa146ad86308fa464a9505708645f99618d54483cbc6b746b656f26a3fb.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5644 -ip 5644

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 5644 -s 1076

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 14.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 comercializadoradeinsumos.cl udp
US 162.240.106.189:443 comercializadoradeinsumos.cl tcp
US 8.8.8.8:53 189.106.240.162.in-addr.arpa udp
US 8.8.8.8:53 32.169.19.2.in-addr.arpa udp
US 8.8.8.8:53 212.20.149.52.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 72.208.201.84.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:\Windows\Resources\primy.ini

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

C:\Users\Admin\AppData\Local\Temp\nsz9E54.tmp\System.dll

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

memory/3256-23237-0x0000000002F20000-0x0000000003CD5000-memory.dmp

memory/3256-23238-0x00000000777F1000-0x0000000077911000-memory.dmp

memory/3256-23239-0x00000000744E5000-0x00000000744E6000-memory.dmp

memory/3256-23240-0x0000000002F20000-0x0000000003CD5000-memory.dmp

memory/5644-23241-0x0000000000400000-0x0000000001654000-memory.dmp

memory/5644-23242-0x0000000001660000-0x0000000002415000-memory.dmp

memory/5644-23243-0x0000000077878000-0x0000000077879000-memory.dmp

memory/5644-23244-0x0000000077895000-0x0000000077896000-memory.dmp

memory/5644-23248-0x0000000000400000-0x0000000001654000-memory.dmp

memory/5644-23249-0x0000000000401000-0x0000000000404000-memory.dmp

memory/5644-23250-0x0000000001660000-0x0000000002415000-memory.dmp

memory/5644-23251-0x0000000000400000-0x0000000001654000-memory.dmp

memory/5644-23252-0x00000000777F1000-0x0000000077911000-memory.dmp

memory/5644-23253-0x0000000000400000-0x0000000001654000-memory.dmp

memory/5644-23254-0x0000000000401000-0x0000000000404000-memory.dmp

memory/5644-23255-0x0000000000400000-0x0000000001654000-memory.dmp

memory/5644-23256-0x0000000000400000-0x0000000001654000-memory.dmp

memory/5644-23257-0x0000000000400000-0x0000000001654000-memory.dmp

memory/5644-23258-0x0000000000401000-0x0000000000404000-memory.dmp