remcos | bad948017a4001a3e9a82fd53bfddb4fd9ddeba4a03eae6aa71a48f3eb69eaad

Analysis

max time kernel
147s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
01-02-2025 03:38

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General

Target

vstdlib_s64.dll
Size

13.8MB
MD5

724018fc656d5524d57ec1500b267ff2
SHA1

d9a7f02b5d3286693491280fd98314c69c4fb25d
SHA256

6cde255c9081211f04f2aa0fa6c04dcc1575d52a93b78639585d48fc9fa86a3f
SHA512

232a799e61e9b360e8f3ee15f1b0f93f6810a70df2ca5b11abd1499301109346ee1a974a70b95069fef2e224d80d1c5d90400ff6931ddf1320d2e5322b2888f8
SSDEEP

196608:7WKjkDLnhh2IwfWbjWm1soVTrtvGPrHBGBdD:SKjSh2CbSAsWPtEDkB

Score

10^/10

remcos remotehost discovery rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

2.58.56.182:2404

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
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-GM05WY
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
Remcos family
remcos

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3432 set thread context of 1700	3432	rundll32.exe	84

Drops file in Windows directory 64 IoCs

description	ioc	Process
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\AgentService.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\connect.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\AcXtrnal.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\AdmTmpl.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\BackgroundTransferHost.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_10002.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\d3d10.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\dafupnp.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\DeviceUpdateAgent.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\Apphlpdm.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\appidcertstorecheck.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\CPFilters.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_28595.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_28592.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\DataStoreCacheDumpTool.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_20936.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\crypttpmeksvc.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\DefaultHrtfs.bin	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\ClipSVC.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\ApplySettingsTemplateCatalog.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\AppVNice.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\BluetoothPairingSystemToastIcon.contrast-white.png	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\certcli.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_20107.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\BthTelemetry.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\changepk.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\credssp.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\DialogBlockingManager.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\ApplicationFrameHost.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\CHxReadingStringIME.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\CloudNotifications.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\cttunesvr.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_037.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_10005.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_1140.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\bcdboot.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\DeviceElementSource.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\atlthunk.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\autopilot.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\colbact.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_869.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\asycfilt.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\DeviceMetadataRetrievalClient.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\bitsadmin.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\BitsProxy.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\cryptxml.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_775.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\difxapi.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\bcastdvr.proxy.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\blbres.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\cmmon32.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\das.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\ApplyTrustOffline.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_1143.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\advapi32res.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\APHostClient.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\ComputerDefaults.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_874.NLS	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\@bitlockertoastimage.png	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\aadcloudap.dll	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\AppHostRegistrationVerifier.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\clip.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\control.exe	rundll32.exe
File created	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RootServices\C_10001.NLS	rundll32.exe

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	ilasm.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3432	rundll32.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3432 wrote to memory of 2448	3432	rundll32.exe	82
PID 3432 wrote to memory of 2448	3432	rundll32.exe	82
PID 3432 wrote to memory of 2448	3432	rundll32.exe	82
PID 3432 wrote to memory of 3760	3432	rundll32.exe	83
PID 3432 wrote to memory of 3760	3432	rundll32.exe	83
PID 3432 wrote to memory of 3760	3432	rundll32.exe	83
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84
PID 3432 wrote to memory of 1700	3432	rundll32.exe	84

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\vstdlib_s64.dll,#1
1⤵
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3432
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"
  2⤵
  PID:2448
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
  2⤵
  PID:3760
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1700-905-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-897-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-914-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-907-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-906-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-898-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-899-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-901-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-900-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-902-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-895-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-894-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-896-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-908-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-909-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-910-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-911-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-912-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-913-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1700-915-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3432-0-0x00000227C7CA0000-0x00000227C7CB0000-memory.dmp

Filesize
64KB

Download