Malware Analysis Report

2025-01-18 09:29

Sample ID 240326-cn9y6sbg63
Target 544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45.js
SHA256 544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45
Tags
strela stealer
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

544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45

Threat Level: Known bad

The file 544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45.js was found to be: Known bad.

Malicious Activity Summary

strela stealer

Strela

Loads dropped DLL

Checks computer location settings

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-03-26 02:14

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-26 02:14

Reported

2024-03-26 02:17

Platform

win7-20240319-en

Max time kernel

121s

Max time network

124s

Command Line

wscript.exe C:\Users\Admin\AppData\Local\Temp\544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45.js

Signatures

Strela

stealer strela

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\system32\rundll32.exe N/A
N/A N/A C:\Windows\system32\rundll32.exe N/A
N/A N/A C:\Windows\system32\rundll32.exe N/A
N/A N/A C:\Windows\system32\rundll32.exe N/A

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2284 wrote to memory of 1996 N/A C:\Windows\system32\wscript.exe C:\Windows\System32\cmd.exe
PID 2284 wrote to memory of 1996 N/A C:\Windows\system32\wscript.exe C:\Windows\System32\cmd.exe
PID 2284 wrote to memory of 1996 N/A C:\Windows\system32\wscript.exe C:\Windows\System32\cmd.exe
PID 1996 wrote to memory of 844 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\findstr.exe
PID 1996 wrote to memory of 844 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\findstr.exe
PID 1996 wrote to memory of 844 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\findstr.exe
PID 1996 wrote to memory of 2276 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\certutil.exe
PID 1996 wrote to memory of 2276 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\certutil.exe
PID 1996 wrote to memory of 2276 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\certutil.exe
PID 1996 wrote to memory of 1008 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1996 wrote to memory of 1008 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1996 wrote to memory of 1008 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1008 wrote to memory of 2484 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe
PID 1008 wrote to memory of 2484 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe
PID 1008 wrote to memory of 2484 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe

Processes

C:\Windows\system32\wscript.exe

wscript.exe C:\Users\Admin\AppData\Local\Temp\544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45.js

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /k copy "C:\Users\Admin\AppData\Local\Temp\544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45.js" "C:\Users\Admin\AppData\Local\Temp\\trousersperpetual.bat" && "C:\Users\Admin\AppData\Local\Temp\\trousersperpetual.bat"

C:\Windows\system32\findstr.exe

findstr /V marrywise ""C:\Users\Admin\AppData\Local\Temp\\trousersperpetual.bat""

C:\Windows\system32\certutil.exe

certutil -f -decode magnificentdevelopment returnready.dll

C:\Windows\system32\cmd.exe

cmd /c rundll32 returnready.dll,m

C:\Windows\system32\rundll32.exe

rundll32 returnready.dll,m

Network

N/A

Files

C:\Users\Admin\AppData\Local\Temp\trousersperpetual.bat

MD5 301503edfb1ea723b231b416c2a81f0f
SHA1 dd41fda85637d2593ef4aad407371ec830fe171d
SHA256 544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45
SHA512 f5df4b28a0f012b458026ef7caa2f460f51476a67e63e63641631dc5672b4920422618afb36af17373ffdfcc678370dc965678f3d3f1dda5326589c2a471f9d5

C:\Users\Admin\AppData\Local\Temp\magnificentdevelopment

MD5 04d8d28e9039e6861017650bb59f24b3
SHA1 53741049bc23ab05658dc32ad54326a87dd0edee
SHA256 54d3f28c9044ca9b16d3584d7bfac00c65f8aa6369801b340e1a7348d4681bef
SHA512 05c9830335b82a5dd020e097e8fb3241e52d60875d951b13dfe82ad590c922ed6884ae5f9a1d2a6270c0d3456bc88ed8d373c5fdedca8a604f65ce986f00cf32

C:\Users\Admin\AppData\Local\Temp\returnready.dll

MD5 9499f14143b34ea7703c73b5f9b37013
SHA1 ceff6b19826c9a4e9b9e8cbcc512d5241a27825e
SHA256 e6991b12e86629b38e178fef129dfda1d454391ffbb236703f8c026d6d55b9a1
SHA512 f14dec41f677fb3e2af064b4b7a6b3b15bec8429a831a78247513853d4ce7511ed37e89e52ebadbed03ab9115dcea3cc316b90e99c939d07402b5a554d722668

memory/2484-393-0x000007FEF6500000-0x000007FEF6547000-memory.dmp

memory/2484-394-0x00000000003A0000-0x00000000003C3000-memory.dmp

memory/2484-395-0x00000000003A0000-0x00000000003C3000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-26 02:14

Reported

2024-03-26 02:17

Platform

win10v2004-20240226-en

Max time kernel

146s

Max time network

155s

Command Line

wscript.exe C:\Users\Admin\AppData\Local\Temp\544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45.js

Signatures

Strela

stealer strela

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-513485977-2495024337-1260977654-1000\Control Panel\International\Geo\Nation C:\Windows\system32\wscript.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\system32\rundll32.exe N/A

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3624 wrote to memory of 1824 N/A C:\Windows\system32\wscript.exe C:\Windows\System32\cmd.exe
PID 3624 wrote to memory of 1824 N/A C:\Windows\system32\wscript.exe C:\Windows\System32\cmd.exe
PID 1824 wrote to memory of 1648 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\findstr.exe
PID 1824 wrote to memory of 1648 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\findstr.exe
PID 1824 wrote to memory of 4256 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\certutil.exe
PID 1824 wrote to memory of 4256 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\certutil.exe
PID 1824 wrote to memory of 2340 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1824 wrote to memory of 2340 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 2340 wrote to memory of 1104 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe
PID 2340 wrote to memory of 1104 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe

Processes

C:\Windows\system32\wscript.exe

wscript.exe C:\Users\Admin\AppData\Local\Temp\544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45.js

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /k copy "C:\Users\Admin\AppData\Local\Temp\544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45.js" "C:\Users\Admin\AppData\Local\Temp\\trousersperpetual.bat" && "C:\Users\Admin\AppData\Local\Temp\\trousersperpetual.bat"

C:\Windows\system32\findstr.exe

findstr /V marrywise ""C:\Users\Admin\AppData\Local\Temp\\trousersperpetual.bat""

C:\Windows\system32\certutil.exe

certutil -f -decode magnificentdevelopment returnready.dll

C:\Windows\system32\cmd.exe

cmd /c rundll32 returnready.dll,m

C:\Windows\system32\rundll32.exe

rundll32 returnready.dll,m

Network

Country Destination Domain Proto
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 194.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 104.241.123.92.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 210.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
US 8.8.8.8:53 173.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 195.201.50.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\trousersperpetual.bat

MD5 301503edfb1ea723b231b416c2a81f0f
SHA1 dd41fda85637d2593ef4aad407371ec830fe171d
SHA256 544887bc3f0dccb610dd7ba35b498a03ea32fca047e133a0639d5bca61cc6f45
SHA512 f5df4b28a0f012b458026ef7caa2f460f51476a67e63e63641631dc5672b4920422618afb36af17373ffdfcc678370dc965678f3d3f1dda5326589c2a471f9d5

C:\Users\Admin\AppData\Local\Temp\magnificentdevelopment

MD5 04d8d28e9039e6861017650bb59f24b3
SHA1 53741049bc23ab05658dc32ad54326a87dd0edee
SHA256 54d3f28c9044ca9b16d3584d7bfac00c65f8aa6369801b340e1a7348d4681bef
SHA512 05c9830335b82a5dd020e097e8fb3241e52d60875d951b13dfe82ad590c922ed6884ae5f9a1d2a6270c0d3456bc88ed8d373c5fdedca8a604f65ce986f00cf32

C:\Users\Admin\AppData\Local\Temp\returnready.dll

MD5 9499f14143b34ea7703c73b5f9b37013
SHA1 ceff6b19826c9a4e9b9e8cbcc512d5241a27825e
SHA256 e6991b12e86629b38e178fef129dfda1d454391ffbb236703f8c026d6d55b9a1
SHA512 f14dec41f677fb3e2af064b4b7a6b3b15bec8429a831a78247513853d4ce7511ed37e89e52ebadbed03ab9115dcea3cc316b90e99c939d07402b5a554d722668

memory/1104-390-0x00007FFF42EF0000-0x00007FFF42F37000-memory.dmp

memory/1104-391-0x000002C183CB0000-0x000002C183CD3000-memory.dmp