Malware Analysis Report

2025-01-02 03:43

Sample ID 240509-l6bc1acc8s
Target a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe
SHA256 a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d
Tags
remcos ajanko evasion execution persistence rat trojan
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

a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d

Threat Level: Known bad

The file a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe was found to be: Known bad.

Malicious Activity Summary

remcos ajanko evasion execution persistence rat trojan

Remcos

UAC bypass

Windows security bypass

Command and Scripting Interpreter: PowerShell

Checks computer location settings

Executes dropped EXE

Windows security modification

Adds Run key to start application

Checks whether UAC is enabled

Suspicious use of SetThreadContext

Program crash

Unsigned PE

Enumerates physical storage devices

System policy modification

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

Delays execution with timeout.exe

Creates scheduled task(s)

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-09 10:08

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-09 10:08

Reported

2024-05-09 10:10

Platform

win7-20240508-en

Max time kernel

122s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe"

Signatures

Processes

C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe

"C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe"

C:\Windows\system32\WerFault.exe

C:\Windows\system32\WerFault.exe -u -p 2548 -s 580

Network

N/A

Files

memory/2548-0-0x000007FEF53B3000-0x000007FEF53B4000-memory.dmp

memory/2548-1-0x0000000001320000-0x000000000137A000-memory.dmp

memory/2548-2-0x000007FEF53B0000-0x000007FEF5D9C000-memory.dmp

memory/2548-3-0x000007FEF53B3000-0x000007FEF53B4000-memory.dmp

memory/2548-4-0x000007FEF53B0000-0x000007FEF5D9C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-09 10:08

Reported

2024-05-09 10:10

Platform

win10v2004-20240426-en

Max time kernel

150s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe"

Signatures

Remcos

rat remcos

UAC bypass

evasion trojan
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Windows security bypass

evasion trojan
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\svchost.exe = "0" C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Windows security modification

evasion trojan
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\svchost.exe = "0" C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\"" C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A

Checks whether UAC is enabled

evasion trojan
Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4792 set thread context of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

Enumerates physical storage devices

Creates scheduled task(s)

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

Delays execution with timeout.exe

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

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4048 wrote to memory of 3096 N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe C:\Windows\System32\cmd.exe
PID 4048 wrote to memory of 3096 N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe C:\Windows\System32\cmd.exe
PID 4048 wrote to memory of 1632 N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe C:\Windows\system32\cmd.exe
PID 4048 wrote to memory of 1632 N/A C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe C:\Windows\system32\cmd.exe
PID 3096 wrote to memory of 2408 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 3096 wrote to memory of 2408 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 1632 wrote to memory of 3560 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 1632 wrote to memory of 3560 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 1632 wrote to memory of 4792 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Roaming\svchost.exe
PID 1632 wrote to memory of 4792 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Roaming\svchost.exe
PID 4792 wrote to memory of 1648 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4792 wrote to memory of 1648 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4792 wrote to memory of 1184 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

System policy modification

evasion
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe

"C:\Users\Admin\AppData\Local\Temp\a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d.exe"

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp45B4.tmp.bat""

C:\Windows\system32\schtasks.exe

schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'

C:\Windows\system32\timeout.exe

timeout 3

C:\Users\Admin\AppData\Roaming\svchost.exe

"C:\Users\Admin\AppData\Roaming\svchost.exe"

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\svchost.exe" -Force

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 1184 -ip 1184

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1184 -s 24

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 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
BE 2.17.196.80:443 www.bing.com tcp
US 8.8.8.8:53 71.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 80.196.17.2.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.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 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 udp

Files

memory/4048-0-0x00000240BB8B0000-0x00000240BB90A000-memory.dmp

memory/4048-1-0x00007FFC73A83000-0x00007FFC73A85000-memory.dmp

memory/4048-2-0x00007FFC73A80000-0x00007FFC74541000-memory.dmp

memory/4048-3-0x00000240D5CF0000-0x00000240D5DC4000-memory.dmp

memory/4048-8-0x00007FFC73A80000-0x00007FFC74541000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp45B4.tmp.bat

MD5 db3a46a9b69dd2336a2bb763b4a8a7ea
SHA1 7b6f18fd9614e819f7eeb4ff48eda983cb6423f8
SHA256 e2a83c68235946fe4ad2deca8242b9d8fd615263a3ba1d6df0addbb6fd0f4d2e
SHA512 89816b7ad676af6da9242c2c17c85b691037271afc41078cbe2e9458350f2a3b990cc0400ff01255e75857783044f1af242490f7cd5471c0dc52aa29c136e022

C:\Users\Admin\AppData\Roaming\svchost.exe

MD5 6396cf12253c6f9a3ce1607be6df95ca
SHA1 a9525c26f5010f1c149403ab83944a575bfb45b5
SHA256 a34cb7528e3a832e088452e887f7c420699d43c928172bdf7fb344b96ff2e81d
SHA512 8c3126ce810f49307dd09b0062c56844a98b7b900fbdf2f7b6f74db9b6a5647f3d3330c3fb7b1664272f485f5d2a2818060b299b0958d9c62ecf0912f9c7276d

memory/1184-13-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1648-23-0x000002257C550000-0x000002257C572000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_lv2pn1vc.5l5.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82