Malware Analysis Report

2025-01-02 03:02

Sample ID 240813-cnv51svajk
Target 91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118
SHA256 5e0414eddc6f66f187a13acfc42cd37568af9f904823e0bceebc5c7f451ea80a
Tags
remcos remotehost discovery rat
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: behavioral5

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral6

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

5e0414eddc6f66f187a13acfc42cd37568af9f904823e0bceebc5c7f451ea80a

Threat Level: Known bad

The file 91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118 was found to be: Known bad.

Malicious Activity Summary

remcos remotehost discovery rat

Remcos

Loads dropped DLL

Suspicious use of SetThreadContext

Enumerates physical storage devices

Program crash

Unsigned PE

System Location Discovery: System Language Discovery

NSIS installer

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Suspicious behavior: MapViewOfSection

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-13 02:13

Signatures

Unsigned PE

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

NSIS installer

installer
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

2024-08-13 02:13

Reported

2024-08-13 02:16

Platform

win7-20240704-en

Max time kernel

148s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe"

Signatures

Remcos

rat remcos

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\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe"

C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe"

Network

Country Destination Domain Proto
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp
VN 103.89.88.238:4299 tcp

Files

\Users\Admin\AppData\Local\Temp\nso582F.tmp\System.dll

MD5 fccff8cb7a1067e23fd2e2b63971a8e1
SHA1 30e2a9e137c1223a78a0f7b0bf96a1c361976d91
SHA256 6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e
SHA512 f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

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

MD5 791b5b4e9636444923a03112bcd4de23
SHA1 a99a6985a2cfa4ff2e9171cb330748da5054381d
SHA256 d98f8a6e2fb2e874c80f8a974ff777d07d2bee075c8893e1e707b625fb6ec834
SHA512 cc64c5a07f8b87718f5e86efa3261af9ee1bca74efab8c42ad13c07a2569b1b8e9402e47d0094bd62f9d16ab740733a833d96369d073c123d5386b7b148ff6a7

memory/2712-12-0x00000000744D0000-0x00000000744DA000-memory.dmp

memory/2780-13-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2712-15-0x00000000744D0000-0x00000000744DA000-memory.dmp

memory/2780-16-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-17-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-18-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-21-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-23-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-25-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-27-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-29-0x0000000000400000-0x0000000000421000-memory.dmp

C:\Users\Admin\AppData\Roaming\excel\logs.dat

MD5 a0af023454bf43e4752ec97a5c6d7aef
SHA1 efea56807e51247d8821450948cbea8cde6de0ef
SHA256 c449c4d7348dff2bd02694ffe525433229e30499e915a1bc1d9a43ffae335ba0
SHA512 6e013dace7ac4fbc522be2afe4db0cc772c4c8df15ef82001feeaad3fbeb2ef937f08d7c4575e642f55c3a6f4e003e69e43e33415eebb0a925fb162a1a0bdd3d

memory/2780-31-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-35-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-37-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-39-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-41-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-42-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-45-0x0000000000400000-0x0000000000421000-memory.dmp

memory/2780-49-0x0000000000400000-0x0000000000421000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-13 02:13

Reported

2024-08-13 02:16

Platform

win10v2004-20240802-en

Max time kernel

140s

Max time network

132s

Command Line

"C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe"

Signatures

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\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe"

C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\91389828fe5ae5e5a96983826c0eb0d0_JaffaCakes118.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4428 -ip 4428

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4428 -s 1012

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=4260,i,10065386245627775856,6567048529106473151,262144 --variations-seed-version --mojo-platform-channel-handle=4004 /prefetch:8

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 75.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.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 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.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

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

MD5 791b5b4e9636444923a03112bcd4de23
SHA1 a99a6985a2cfa4ff2e9171cb330748da5054381d
SHA256 d98f8a6e2fb2e874c80f8a974ff777d07d2bee075c8893e1e707b625fb6ec834
SHA512 cc64c5a07f8b87718f5e86efa3261af9ee1bca74efab8c42ad13c07a2569b1b8e9402e47d0094bd62f9d16ab740733a833d96369d073c123d5386b7b148ff6a7

C:\Users\Admin\AppData\Local\Temp\nsy1B73.tmp\System.dll

MD5 fccff8cb7a1067e23fd2e2b63971a8e1
SHA1 30e2a9e137c1223a78a0f7b0bf96a1c361976d91
SHA256 6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e
SHA512 f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

memory/4428-10-0x0000000074950000-0x000000007495A000-memory.dmp

memory/4428-11-0x0000000074950000-0x000000007495A000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-08-13 02:13

Reported

2024-08-13 02:16

Platform

win7-20240705-en

Max time kernel

121s

Max time network

127s

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 1556 -s 220

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-08-13 02:13

Reported

2024-08-13 02:16

Platform

win10v2004-20240802-en

Max time kernel

140s

Max time network

125s

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 4120 wrote to memory of 724 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4120 wrote to memory of 724 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4120 wrote to memory of 724 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 432 -p 724 -ip 724

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 724 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 17.160.190.20.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 8.8.8.8:53 138.201.86.20.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.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

Files

N/A

Analysis: behavioral5

Detonation Overview

Submitted

2024-08-13 02:13

Reported

2024-08-13 02:16

Platform

win7-20240705-en

Max time kernel

16s

Max time network

18s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\odoomv.dll,#1

Signatures

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 behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2204 wrote to memory of 1696 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1696 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1696 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1696 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1696 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1696 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2204 wrote to memory of 1696 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\odoomv.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\odoomv.dll,#1

Network

N/A

Files

memory/1696-2-0x0000000074670000-0x000000007467A000-memory.dmp

memory/1696-1-0x0000000074660000-0x000000007466A000-memory.dmp

memory/1696-0-0x0000000074670000-0x000000007467A000-memory.dmp

Analysis: behavioral6

Detonation Overview

Submitted

2024-08-13 02:13

Reported

2024-08-13 02:16

Platform

win10v2004-20240802-en

Max time kernel

148s

Max time network

153s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\odoomv.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 5100 wrote to memory of 4260 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 5100 wrote to memory of 4260 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 5100 wrote to memory of 4260 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\odoomv.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\odoomv.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4260 -ip 4260

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 760

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 13.107.21.237:443 g.bing.com tcp
US 8.8.8.8:53 237.21.107.13.in-addr.arpa udp
US 8.8.8.8:53 64.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 138.201.86.20.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 192.142.123.92.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 48.229.111.52.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 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp

Files

memory/4260-0-0x00000000749B0000-0x00000000749BA000-memory.dmp

memory/4260-1-0x00000000749B0000-0x00000000749BA000-memory.dmp