remcos | b8f10c23448f6d30808e7e74322ebd4121cf2c589c86cc3b0b57df6c705a867e

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
17-09-2024 14:04

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General

Target

RFQ PO-DF9087.vbs
Size

876KB
MD5

f427445b955165562cd5fd65a7a31a20
SHA1

dba2cd6d833c67c32a4f67c9df28ddfb6de91d39
SHA256

b8f10c23448f6d30808e7e74322ebd4121cf2c589c86cc3b0b57df6c705a867e
SHA512

73494ee475a97feaeaec4f7187763721b05173da281a08eb62d01462c69a75e7b485f019a1a8f9ef851ff21ca30e6c124570261ac2e2eeb58d2f055a2f96287c
SSDEEP

24576:Y9T0Ol06QuZ+eD1wcJWnRWNlSlok+x3aXNvi0:Y5lDQJBINlSG/qN

Score

10^/10

remcos remotehost collection credential_access discovery rat stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

192.3.101.29:14645

192.3.101.29:1070

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-26HAHO
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/4448-37-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/4888-38-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/3044-40-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/3044-41-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/3044-46-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4448-37-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/3044-40-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/3044-41-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/3044-46-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

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-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
4536	x.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	aspnet_compiler.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 4536 set thread context of 996	4536	x.exe	84
PID 996 set thread context of 3044	996	aspnet_compiler.exe	89
PID 996 set thread context of 4448	996	aspnet_compiler.exe	90
PID 996 set thread context of 4888	996	aspnet_compiler.exe	91

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 4 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	aspnet_compiler.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aspnet_compiler.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aspnet_compiler.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aspnet_compiler.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4536	x.exe
4536	x.exe
4888	aspnet_compiler.exe
4888	aspnet_compiler.exe
3044	aspnet_compiler.exe
3044	aspnet_compiler.exe
3044	aspnet_compiler.exe
3044	aspnet_compiler.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
996	aspnet_compiler.exe
996	aspnet_compiler.exe
996	aspnet_compiler.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4536	x.exe
Token: SeDebugPrivilege	4888	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 3172 wrote to memory of 4536	3172	WScript.exe	82
PID 3172 wrote to memory of 4536	3172	WScript.exe	82
PID 4536 wrote to memory of 376	4536	x.exe	83
PID 4536 wrote to memory of 376	4536	x.exe	83
PID 4536 wrote to memory of 376	4536	x.exe	83
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 4536 wrote to memory of 996	4536	x.exe	84
PID 996 wrote to memory of 3044	996	aspnet_compiler.exe	89
PID 996 wrote to memory of 3044	996	aspnet_compiler.exe	89
PID 996 wrote to memory of 3044	996	aspnet_compiler.exe	89
PID 996 wrote to memory of 3044	996	aspnet_compiler.exe	89
PID 996 wrote to memory of 4448	996	aspnet_compiler.exe	90
PID 996 wrote to memory of 4448	996	aspnet_compiler.exe	90
PID 996 wrote to memory of 4448	996	aspnet_compiler.exe	90
PID 996 wrote to memory of 4448	996	aspnet_compiler.exe	90
PID 996 wrote to memory of 4888	996	aspnet_compiler.exe	91
PID 996 wrote to memory of 4888	996	aspnet_compiler.exe	91
PID 996 wrote to memory of 4888	996	aspnet_compiler.exe	91
PID 996 wrote to memory of 4888	996	aspnet_compiler.exe	91

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RFQ PO-DF9087.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3172
- C:\Users\Admin\AppData\Local\Temp\x.exe
  "C:\Users\Admin\AppData\Local\Temp\x.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4536
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:376
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:996
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
      C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe /stext "C:\Users\Admin\AppData\Local\Temp\fxnyblxlgnytnggvjmb"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:3044
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
      C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe /stext "C:\Users\Admin\AppData\Local\Temp\izbqbdinuvqyxmuztxogxih"
      4⤵
      Accesses Microsoft Outlook accounts
      System Location Discovery: System Language Discovery
      PID:4448
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
      C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe /stext "C:\Users\Admin\AppData\Local\Temp\stgjcwtgidikzbqlkaiianbnmr"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4888

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\fxnyblxlgnytnggvjmb

Filesize
4KB

MD5
1891919175c888ce82e9bd8a047b01ad

SHA1
502a6892a5d27ecb791ac5aa6d8586944f540453

SHA256
a6c43b4e4b8681cf0ef56c49c730fa77e34dc82db0260253a3ba75039030b9ec

SHA512
8bb940050b1abf6c27db133ed446f41e108f670f361ed5102408832ce33d9b87cd0880723441f1632292eeeb0a319c4e0fac0ea659eb55ebe1130cc3e6c776a3

Download Submit
C:\Users\Admin\AppData\Local\Temp\x.exe

Filesize
570KB

MD5
a0912626829ec19aee158d7cec1bd06f

SHA1
f046bcd08dc142885a59fd9a25fd7468ef028cdf

SHA256
e373701e9c2ec2c18ed363c6c699c1487646cf2dd696f5504f7ce24593b69205

SHA512
880450aeda0ae6c73bb448ed31267fdede0a0be1f2ad00810e106b58845741d915b27761e9509bb2d3b19262e8a4f95db99475d1ee3acae7580c432a3e90518e

Download Submit
memory/996-52-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/996-57-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-63-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-53-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-61-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-17-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-19-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-20-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-21-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-22-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-23-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-60-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-25-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-26-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-27-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-55-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-30-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-51-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/996-48-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/996-56-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-62-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-59-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-28-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-54-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/996-58-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3044-39-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3044-46-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3044-31-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3044-41-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3044-40-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4448-34-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4448-37-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4448-33-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4536-15-0x000001FA11260000-0x000001FA11268000-memory.dmp

Filesize
32KB

Download
memory/4536-11-0x00007FFA7BA23000-0x00007FFA7BA25000-memory.dmp

Filesize
8KB

Download
memory/4536-12-0x000001FA0F600000-0x000001FA0F684000-memory.dmp

Filesize
528KB

Download
memory/4536-13-0x000001FA112C0000-0x000001FA1133A000-memory.dmp

Filesize
488KB

Download
memory/4536-24-0x00007FFA7BA20000-0x00007FFA7C4E1000-memory.dmp

Filesize
10.8MB

Download
memory/4536-14-0x000001FA0FA30000-0x000001FA0FA3C000-memory.dmp

Filesize
48KB

Download
memory/4536-16-0x00007FFA7BA20000-0x00007FFA7C4E1000-memory.dmp

Filesize
10.8MB

Download
memory/4888-35-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4888-36-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4888-38-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download