remcos | 39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a

Analysis

max time kernel
148s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
06/08/2024, 21:08

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General

Target
MalwareBazaar.exe
Size 670KB
Sample240806-zy4apsthnd
SHA256 39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a
MD5 31dea80f55b9485ad4dd9a8636b7b12e
SHA1 d6987a2bed5c0af40ffa425a8bcd5960bc2a16b7
SHA512 2cca917add60b40c877a315b50382583c3a6a07055290dfa7345214e6d9cbfe501ef524f65f3427672231b8a241e8ec0394231e1cd0d606baa706bc9e3df84ad
SSDEEP 12288:cu70DgkcKSx+zPDp2eZcnbgvsFxqFGC4SEYSU+9vzqqYVYRDl0u:T4DgksE3ZvvsFxqFX/EYD+1fYVsn
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos remotehost collection credential_access discovery rat stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

194.169.175.190:2404

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-LBZ2BK
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 8 IoCs

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

resource	yara_rule
behavioral2/memory/4800-26-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/5028-25-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/4800-27-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/4800-31-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/1476-36-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1476-35-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1476-37-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/5028-39-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4800-26-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/4800-27-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/4800-31-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/5028-25-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/5028-39-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Caspol.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 4420 set thread context of 1780	4420	MalwareBazaar.exe	82
PID 1780 set thread context of 5028	1780	Caspol.exe	86
PID 1780 set thread context of 4800	1780	Caspol.exe	87
PID 1780 set thread context of 1476	1780	Caspol.exe	89

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

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
5028	Caspol.exe
5028	Caspol.exe
1476	Caspol.exe
1476	Caspol.exe
5028	Caspol.exe
5028	Caspol.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
1780	Caspol.exe
1780	Caspol.exe
1780	Caspol.exe
1780	Caspol.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1476	Caspol.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 4420 wrote to memory of 1780	4420	MalwareBazaar.exe	82
PID 1780 wrote to memory of 5028	1780	Caspol.exe	86
PID 1780 wrote to memory of 5028	1780	Caspol.exe	86
PID 1780 wrote to memory of 5028	1780	Caspol.exe	86
PID 1780 wrote to memory of 5028	1780	Caspol.exe	86
PID 1780 wrote to memory of 4800	1780	Caspol.exe	87
PID 1780 wrote to memory of 4800	1780	Caspol.exe	87
PID 1780 wrote to memory of 4800	1780	Caspol.exe	87
PID 1780 wrote to memory of 4800	1780	Caspol.exe	87
PID 1780 wrote to memory of 5016	1780	Caspol.exe	88
PID 1780 wrote to memory of 5016	1780	Caspol.exe	88
PID 1780 wrote to memory of 5016	1780	Caspol.exe	88
PID 1780 wrote to memory of 1476	1780	Caspol.exe	89
PID 1780 wrote to memory of 1476	1780	Caspol.exe	89
PID 1780 wrote to memory of 1476	1780	Caspol.exe	89
PID 1780 wrote to memory of 1476	1780	Caspol.exe	89

C:\Users\Admin\AppData\Local\Temp\MalwareBazaar.exe
"C:\Users\Admin\AppData\Local\Temp\MalwareBazaar.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4420
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:1780
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\vtjk"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:5028
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\fnovqvnp"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:4800
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\ihunqoyimpv"
    3⤵
    PID:5016
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\ihunqoyimpv"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1476

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

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

vtjk

Path C:\Users\Admin\AppData\Local\Temp\vtjk
Size 4KB
SHA256 0515f49138d74283f9ac1042fd1a384f715b74c2b99193454dbb0cd585097727
MD5 ea01dd92b15d2f570f6b167dad2d1fd0
SHA1 7b89141d4c3eb2f29d096f28a9bfe66eb006224a
SHA512 0e7695aea30250a41829fa4abb681b8c3ed4c0955e18f1f9f3a5456bfb3a76f016f538e557bf29b99ab6ab48c846f9fa3c4bccd8cb5fe73099a81b5946029ec8
SSDEEP 48:wvvv05xfvvc5xfdvv05xBvv05xakvv057:mvwxvYp1vwPvwbvw7
MD5 SHA1 SHA512 SSDEEP

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memory/1476-37-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/1476-34-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/1476-35-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/1476-36-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/1476-32-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/1780-14-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-49-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-9-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-10-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-11-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-53-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-13-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-15-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-7-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-17-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-52-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-51-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-50-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-8-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-48-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-47-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-46-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-41-0x0000000010000000-0x0000000010019000-memory.dmp

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memory/1780-45-0x0000000010000000-0x0000000010019000-memory.dmp

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memory/1780-5-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-54-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-55-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-56-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-57-0x0000000000400000-0x0000000000482000-memory.dmp

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memory/1780-44-0x0000000010000000-0x0000000010019000-memory.dmp

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memory/4420-12-0x00007FF82E530000-0x00007FF82EFF1000-memory.dmp

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memory/4420-0-0x00007FF82E533000-0x00007FF82E535000-memory.dmp

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memory/4420-1-0x000001F3DA5F0000-0x000001F3DA69C000-memory.dmp

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memory/4420-2-0x000001F3DC3A0000-0x000001F3DC41E000-memory.dmp

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memory/4420-3-0x00007FF82E530000-0x00007FF82EFF1000-memory.dmp

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memory/4420-4-0x000001F3DC370000-0x000001F3DC384000-memory.dmp

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memory/4800-31-0x0000000000400000-0x0000000000462000-memory.dmp

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memory/4800-23-0x0000000000400000-0x0000000000462000-memory.dmp

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memory/4800-27-0x0000000000400000-0x0000000000462000-memory.dmp

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memory/4800-26-0x0000000000400000-0x0000000000462000-memory.dmp

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memory/4800-20-0x0000000000400000-0x0000000000462000-memory.dmp

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memory/5028-25-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/5028-18-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/5028-39-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/5028-24-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/5028-22-0x0000000000400000-0x0000000000478000-memory.dmp

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