Malware Analysis Report

2024-10-19 08:16

Sample ID 240831-j4m8nstfmk
Target 5044679442b15f0bf4197d73b3ca20f1cc247ab62846662cacdc68bb94ebeb51
SHA256 5044679442b15f0bf4197d73b3ca20f1cc247ab62846662cacdc68bb94ebeb51
Tags
expiro backdoor discovery
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 Overview

score
10/10

SHA256

5044679442b15f0bf4197d73b3ca20f1cc247ab62846662cacdc68bb94ebeb51

Threat Level: Known bad

The file 5044679442b15f0bf4197d73b3ca20f1cc247ab62846662cacdc68bb94ebeb51 was found to be: Known bad.

Malicious Activity Summary

expiro backdoor discovery

Expiro, m0yv

Expiro payload

System Location Discovery: System Language Discovery

Unsigned PE

Program crash

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-31 08:13

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-31 08:13

Reported

2024-08-31 08:16

Platform

win7-20240729-en

Max time kernel

120s

Max time network

121s

Command Line

"C:\Users\Admin\AppData\Local\Temp\19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2.exe"

Signatures

Expiro, m0yv

backdoor expiro

Expiro payload

backdoor
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

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\19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2.exe

"C:\Users\Admin\AppData\Local\Temp\19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2264 -s 68

Network

N/A

Files

memory/2264-0-0x0000000000E5C000-0x0000000000EEF000-memory.dmp

memory/2264-1-0x0000000000DF0000-0x0000000000EEF000-memory.dmp

memory/2264-2-0x0000000000E5C000-0x0000000000EEF000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-31 08:13

Reported

2024-08-31 08:16

Platform

win10v2004-20240802-en

Max time kernel

133s

Max time network

128s

Command Line

"C:\Users\Admin\AppData\Local\Temp\19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2.exe"

Signatures

Expiro, m0yv

backdoor expiro

Expiro payload

backdoor
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
N/A N/A N/A N/A

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\19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2.exe

"C:\Users\Admin\AppData\Local\Temp\19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4984 -ip 4984

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4984 -s 252

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=3980,i,3239535018877284530,3457823197501312703,262144 --variations-seed-version --mojo-platform-channel-handle=4420 /prefetch:8

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 0.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.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 23.236.111.52.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 10.28.171.150.in-addr.arpa udp

Files

memory/4984-0-0x0000000000C3C000-0x0000000000CCF000-memory.dmp

memory/4984-1-0x0000000000BD0000-0x0000000000CCF000-memory.dmp

memory/4984-3-0x0000000000BD0000-0x0000000000CCF000-memory.dmp

memory/4984-2-0x0000000000C3C000-0x0000000000CCF000-memory.dmp