remcos | bcc3db95215f4c2c8d821377f9a98f4d0df6078cee6a1b100480786973f1b5b5

Analysis

max time kernel
150s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
29/07/2024, 07:01

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General

Target
tmp.exe
Size 851KB
Sample240729-hs8vkasard
SHA256 bcc3db95215f4c2c8d821377f9a98f4d0df6078cee6a1b100480786973f1b5b5
MD5 2153f4ceedf90e1f7a781a93fa183417
SHA1 a732fe0e397a3ed7250441a322ca3b77e88cf792
SHA512 d2590d7d5d4d8fff0983c523bc16e0f71576756fa39ce052b39d87c24e0bfe7ab87953ca5b7432251af5629f42a70651139800b7c054def8f416c8ba01e705d4
SSDEEP 24576:KYBfQYzELibC4jGl7Wud08XzvFn9j5Utq:KYBtbC4ql0ozt9j5Ut
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos remotehost collection credential_access discovery execution rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

107.175.229.139:8823

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-2BGC0K
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
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Detected Nirsoft tools 5 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/116-53-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/1376-50-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/1376-49-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/2784-58-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1376-60-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/116-53-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/1376-50-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1376-49-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1376-60-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Drops startup file 2 IoCs

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

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-384068567-2943195810-3631207890-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	tmp.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 3916 set thread context of 3184	3916	tmp.exe	89
PID 3184 set thread context of 1376	3184	tmp.exe	90
PID 3184 set thread context of 116	3184	tmp.exe	91
PID 3184 set thread context of 2784	3184	tmp.exe	93

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3252	Powershell.exe

System Location Discovery: System Language Discovery 1 TTPs 6 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	tmp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmp.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
3252	Powershell.exe
3252	Powershell.exe
1376	tmp.exe
1376	tmp.exe
2784	tmp.exe
2784	tmp.exe
1376	tmp.exe
1376	tmp.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
3184	tmp.exe
3184	tmp.exe
3184	tmp.exe
3184	tmp.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3252	Powershell.exe
Token: SeDebugPrivilege	2784	tmp.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3184	tmp.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3916 wrote to memory of 3252	3916	tmp.exe	87
PID 3916 wrote to memory of 3252	3916	tmp.exe	87
PID 3916 wrote to memory of 3252	3916	tmp.exe	87
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3916 wrote to memory of 3184	3916	tmp.exe	89
PID 3184 wrote to memory of 1376	3184	tmp.exe	90
PID 3184 wrote to memory of 1376	3184	tmp.exe	90
PID 3184 wrote to memory of 1376	3184	tmp.exe	90
PID 3184 wrote to memory of 1376	3184	tmp.exe	90
PID 3184 wrote to memory of 116	3184	tmp.exe	91
PID 3184 wrote to memory of 116	3184	tmp.exe	91
PID 3184 wrote to memory of 116	3184	tmp.exe	91
PID 3184 wrote to memory of 116	3184	tmp.exe	91
PID 3184 wrote to memory of 632	3184	tmp.exe	92
PID 3184 wrote to memory of 632	3184	tmp.exe	92
PID 3184 wrote to memory of 632	3184	tmp.exe	92
PID 3184 wrote to memory of 2784	3184	tmp.exe	93
PID 3184 wrote to memory of 2784	3184	tmp.exe	93
PID 3184 wrote to memory of 2784	3184	tmp.exe	93
PID 3184 wrote to memory of 2784	3184	tmp.exe	93

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3916
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\Powershell.exe
  "Powershell.exe" -ExecutionPolicy Bypass -command Copy-Item 'C:\Users\Admin\AppData\Local\Temp\tmp.exe' 'C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\.exe'
  2⤵
  - Drops startup file
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3252
- C:\Users\Admin\AppData\Local\Temp\tmp.exe
  "C:\Users\Admin\AppData\Local\Temp\tmp.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3184
- - C:\Users\Admin\AppData\Local\Temp\tmp.exe
    C:\Users\Admin\AppData\Local\Temp\tmp.exe /stext "C:\Users\Admin\AppData\Local\Temp\zfhjbjmseuuyx"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:1376
- - C:\Users\Admin\AppData\Local\Temp\tmp.exe
    C:\Users\Admin\AppData\Local\Temp\tmp.exe /stext "C:\Users\Admin\AppData\Local\Temp\khmuucxuscmliixk"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:116
- - C:\Users\Admin\AppData\Local\Temp\tmp.exe
    C:\Users\Admin\AppData\Local\Temp\tmp.exe /stext "C:\Users\Admin\AppData\Local\Temp\ubamvuingkepkwloqqp"
    3⤵
    PID:632
- - C:\Users\Admin\AppData\Local\Temp\tmp.exe
    C:\Users\Admin\AppData\Local\Temp\tmp.exe /stext "C:\Users\Admin\AppData\Local\Temp\ubamvuingkepkwloqqp"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2784

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

logs.dat

Path C:\ProgramData\remcos\logs.dat
Size 144B
SHA256 3a309c14fdf402738c7c3c143783a821bc03e697300fe5ccacc3c2bbd68aa3f1
MD5 54a751cf9ccd1da2fcfe9cc2b29f0480
SHA1 d562710a6f885891e6da97568a6ac4f9db29eeac
SHA512 356770cbc430c779dd59eb9837c8d76bf36f03e3e3d05aafefd773f129296eb4566e6f7bc74fd4d2365e2c06c1cf93b65155ec70ffebf2917e3dab051d1a335b
MD5 SHA1 SHA512

Submit Download

__PSScriptPolicyTest_5hwruku1.2un.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5hwruku1.2un.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

Submit Download

zfhjbjmseuuyx

Path C:\Users\Admin\AppData\Local\Temp\zfhjbjmseuuyx
Size 4KB
SHA256 2bd023dd922e93f6c6f471751ae97a1fd24a93aa4230e53ac91b8c37dab9b185
MD5 463b5cfc270ed672e140fc2c1a25aec1
SHA1 23e37a49996b1208888e054fab11aa1e1a81f649
SHA512 b0fa0425dc462fa10a56fb28f36b84f3a0e6426922c1fd37e56c4406e713a00aef2bbc04024f06133d1f63960a97372feb32fd4ebf43105b9d9823f37820b4b6
SSDEEP 48:wvvv0QCxfvvcQCxfdvv0QCxBvv0QCxakvv0QC7:mvQxvYp1vQPvQbvQ7
MD5 SHA1 SHA512 SSDEEP

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memory/116-51-0x0000000000400000-0x0000000000462000-memory.dmp

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memory/116-48-0x0000000000400000-0x0000000000462000-memory.dmp

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memory/116-53-0x0000000000400000-0x0000000000462000-memory.dmp

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memory/1376-60-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/1376-49-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/1376-50-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/1376-47-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/1376-45-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/2784-54-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/2784-58-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/2784-52-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/3184-42-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-95-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-110-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-15-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-111-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-23-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-28-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-103-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-30-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-33-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-34-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-102-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-36-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-62-0x0000000010000000-0x0000000010019000-memory.dmp

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memory/3184-37-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-94-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-41-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-87-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-44-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-86-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-82-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-78-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-77-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-16-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-66-0x0000000010000000-0x0000000010019000-memory.dmp

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memory/3184-67-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/3184-65-0x0000000010000000-0x0000000010019000-memory.dmp

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memory/3252-70-0x0000000006130000-0x0000000006152000-memory.dmp

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memory/3252-8-0x0000000074D20000-0x00000000754D0000-memory.dmp

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memory/3252-17-0x00000000055D0000-0x0000000005636000-memory.dmp

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memory/3252-14-0x0000000004CD0000-0x0000000004D36000-memory.dmp

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memory/3252-29-0x0000000005640000-0x0000000005994000-memory.dmp

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memory/3252-35-0x0000000005C20000-0x0000000005C3E000-memory.dmp

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memory/3252-38-0x0000000005C40000-0x0000000005C8C000-memory.dmp

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memory/3252-12-0x0000000004C30000-0x0000000004C52000-memory.dmp

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memory/3252-68-0x00000000061A0000-0x0000000006236000-memory.dmp

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memory/3252-69-0x00000000060D0000-0x00000000060EA000-memory.dmp

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memory/3252-9-0x0000000004630000-0x0000000004666000-memory.dmp

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memory/3252-74-0x0000000074D20000-0x00000000754D0000-memory.dmp

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memory/3252-10-0x0000000074D20000-0x00000000754D0000-memory.dmp

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memory/3252-11-0x0000000004DB0000-0x00000000053D8000-memory.dmp

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memory/3916-7-0x0000000005820000-0x00000000058BC000-memory.dmp

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memory/3916-1-0x0000000000930000-0x0000000000A0C000-memory.dmp

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memory/3916-13-0x0000000005560000-0x0000000005568000-memory.dmp

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memory/3916-0-0x0000000074D2E000-0x0000000074D2F000-memory.dmp

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memory/3916-40-0x0000000074D20000-0x00000000754D0000-memory.dmp

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memory/3916-4-0x0000000005520000-0x000000000552A000-memory.dmp

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memory/3916-6-0x0000000074D20000-0x00000000754D0000-memory.dmp

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memory/3916-2-0x00000000059B0000-0x0000000005F54000-memory.dmp

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memory/3916-5-0x00000000055A0000-0x000000000564E000-memory.dmp

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memory/3916-3-0x0000000005400000-0x0000000005492000-memory.dmp

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