remcos | c8092ae8e5c2fcb2f4ed5be1dac0723ef951a8b445c45aa68376d093fa3a5623

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
13/02/2023, 11:33

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General

Target
INV2023021306070335CN.exe
Size 7KB
Sample230213-nn32eacd3w
SHA256 c8092ae8e5c2fcb2f4ed5be1dac0723ef951a8b445c45aa68376d093fa3a5623
MD5 9a41223b386389a4f3f78b5598bac55b
SHA1 4029fb38507d83e47588f9843d8afcf74003f9ea
SHA512 2c11e76d43633e9d4ed29d972cd2485b50f06e03a2d544188f92b77546557644aa6037b8799cda6e688ac4e59ecddc3347ecfe04e51ade8d738f8ad9265620f5
SSDEEP 96:YpUIpb4xaVGEp7QLDsc9Vr/RZBzh4HbKlKetY8nXGkzZizNt:QUjwcESLgKV7TNh4HUKetY8nXrNE
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos remotehost collection persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

obologs.work.gd:34346

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-A5LMGK
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

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/5112-154-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/4664-156-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/4664-157-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Nirsoft 4 IoCs

resource	yara_rule
behavioral2/memory/5112-154-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/2448-155-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4664-156-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/4664-157-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

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	INV2023021306070335CN.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	aspnet_compiler.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Utlzn = "\"C:\\Users\\Admin\\AppData\\Roaming\\Bbojo\\Utlzn.exe\""	INV2023021306070335CN.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 4984 set thread context of 4652	4984	INV2023021306070335CN.exe	91
PID 4652 set thread context of 4664	4652	aspnet_compiler.exe	93
PID 4652 set thread context of 5112	4652	aspnet_compiler.exe	94
PID 4652 set thread context of 2448	4652	aspnet_compiler.exe	95

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 10 IoCs

pid	Process
2484	powershell.exe
2484	powershell.exe
4984	INV2023021306070335CN.exe
4984	INV2023021306070335CN.exe
4664	aspnet_compiler.exe
4664	aspnet_compiler.exe
2448	aspnet_compiler.exe
2448	aspnet_compiler.exe
4664	aspnet_compiler.exe
4664	aspnet_compiler.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
4652	aspnet_compiler.exe
4652	aspnet_compiler.exe
4652	aspnet_compiler.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4984	INV2023021306070335CN.exe
Token: SeDebugPrivilege	2484	powershell.exe
Token: SeDebugPrivilege	2448	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 4984 wrote to memory of 2484	4984	INV2023021306070335CN.exe	82
PID 4984 wrote to memory of 2484	4984	INV2023021306070335CN.exe	82
PID 4984 wrote to memory of 2484	4984	INV2023021306070335CN.exe	82
PID 4984 wrote to memory of 4588	4984	INV2023021306070335CN.exe	90
PID 4984 wrote to memory of 4588	4984	INV2023021306070335CN.exe	90
PID 4984 wrote to memory of 4588	4984	INV2023021306070335CN.exe	90
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4984 wrote to memory of 4652	4984	INV2023021306070335CN.exe	91
PID 4652 wrote to memory of 4664	4652	aspnet_compiler.exe	93
PID 4652 wrote to memory of 4664	4652	aspnet_compiler.exe	93
PID 4652 wrote to memory of 4664	4652	aspnet_compiler.exe	93
PID 4652 wrote to memory of 4664	4652	aspnet_compiler.exe	93
PID 4652 wrote to memory of 5112	4652	aspnet_compiler.exe	94
PID 4652 wrote to memory of 5112	4652	aspnet_compiler.exe	94
PID 4652 wrote to memory of 5112	4652	aspnet_compiler.exe	94
PID 4652 wrote to memory of 5112	4652	aspnet_compiler.exe	94
PID 4652 wrote to memory of 2448	4652	aspnet_compiler.exe	95
PID 4652 wrote to memory of 2448	4652	aspnet_compiler.exe	95
PID 4652 wrote to memory of 2448	4652	aspnet_compiler.exe	95
PID 4652 wrote to memory of 2448	4652	aspnet_compiler.exe	95

C:\Users\Admin\AppData\Local\Temp\INV2023021306070335CN.exe
"C:\Users\Admin\AppData\Local\Temp\INV2023021306070335CN.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4984
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2484
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
  2⤵
  PID:4588
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:4652
- - 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\ehnnsdnoruwovqlmkocqiilvfg"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:4664
- - 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\oktflvyqfcotfwhquyoktugeoumknw"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:5112
- - 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\zegylojkbkgyhdvuljjlwztvpbwtghsed"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2448

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

ehnnsdnoruwovqlmkocqiilvfg

Path C:\Users\Admin\AppData\Local\Temp\ehnnsdnoruwovqlmkocqiilvfg
Size 4KB
SHA256 bd8156713974af3003c418302d3647fa84f62836fe83613c05e8bc40cb06a867
MD5 952a930b9fe70f809a67cb4e765c9448
SHA1 7e6c235246cc1be14d8a01ee7688a2a2471d44c9
SHA512 10d12f2412fd2cb9ecf47cccd0261b17d9a3323957602c06795c4b2244306837d0a979ec6e552dc023ee81719ebcb9455bdb6f9d44f07788664994d1498452fb
SSDEEP 48:wvvv0DxfvvcDxfdvv0DxBvv0Dxakvv0D7:mvWxvep1vWPvWbvW7
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/2448-155-0x0000000000400000-0x0000000000424000-memory.dmp

Download

memory/2484-139-0x0000000004EF0000-0x0000000005518000-memory.dmp

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memory/2484-144-0x0000000006150000-0x000000000616A000-memory.dmp

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memory/2484-138-0x0000000002660000-0x0000000002696000-memory.dmp

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memory/2484-140-0x0000000005590000-0x00000000055F6000-memory.dmp

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memory/2484-141-0x0000000005600000-0x0000000005666000-memory.dmp

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memory/2484-142-0x0000000005C50000-0x0000000005C6E000-memory.dmp

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memory/2484-143-0x00000000074B0000-0x0000000007B2A000-memory.dmp

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memory/4652-148-0x0000000000400000-0x0000000000480000-memory.dmp

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memory/4652-159-0x0000000010000000-0x0000000010019000-memory.dmp

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memory/4652-147-0x0000000000400000-0x0000000000480000-memory.dmp

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memory/4652-164-0x0000000000400000-0x0000000000480000-memory.dmp

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memory/4652-149-0x0000000000400000-0x0000000000480000-memory.dmp

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memory/4652-150-0x0000000000400000-0x0000000000480000-memory.dmp

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memory/4652-163-0x0000000010000000-0x0000000010019000-memory.dmp

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memory/4652-162-0x0000000010000000-0x0000000010019000-memory.dmp

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memory/4664-157-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/4664-156-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/4984-134-0x0000000005960000-0x00000000059F2000-memory.dmp

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memory/4984-132-0x0000000000F10000-0x0000000000F18000-memory.dmp

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memory/4984-135-0x00000000058B0000-0x00000000058BA000-memory.dmp

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memory/4984-133-0x0000000005F10000-0x00000000064B4000-memory.dmp

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memory/4984-136-0x0000000007680000-0x00000000076A2000-memory.dmp

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memory/5112-154-0x0000000000400000-0x0000000000457000-memory.dmp

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