remcos | caf42d7fbf9c9e246bf7266cd08a763f39ee1eaf06c7f6ce0758be2511458b5a

General

Target

lol.exe
Size

482KB
MD5

d82f58136dcb77606b7298c80818fbf8
SHA1

a1a75c2416da3bf3294e1953c88037a0eb551beb
SHA256

caf42d7fbf9c9e246bf7266cd08a763f39ee1eaf06c7f6ce0758be2511458b5a
SHA512

d845e38e727c2990e3a9a33ee1e97ed7c677c601f03a68aabe70c997983e3187932a5b6a3f5c335f69230b06701a9f8ec1ec40d39c5ce5e895750f3bb29522a8
SSDEEP

6144:KTz+c6KHYBhDc1RGJdv//NkUn+N5Bkf/0TELRvIZPjbsAOZZBAXccrS4T4:KTlrYw1RUh3NFn+N5WfIQIjbs/ZBkT4

Score

10^/10

remcos akpu idemili collection credential_access discovery rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

Akpu idemili

C2

closen.kozow.com: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-3WVVD0
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 9 IoCs

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

resource	yara_rule
behavioral2/memory/1316-11-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/4876-20-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/2888-24-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/2888-16-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4876-15-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/1316-14-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/4876-13-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/2888-12-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1316-27-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4876-20-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/4876-15-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/4876-13-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/1316-11-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1316-14-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1316-27-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

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-1-5-21-2412658365-3084825385-3340777666-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	lol.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4652 set thread context of 1316	4652	lol.exe	88
PID 4652 set thread context of 4876	4652	lol.exe	89
PID 4652 set thread context of 2888	4652	lol.exe	90

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

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1316	lol.exe
1316	lol.exe
2888	lol.exe
2888	lol.exe
1316	lol.exe
1316	lol.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
4652	lol.exe
4652	lol.exe
4652	lol.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2888	lol.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4652	lol.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4652 wrote to memory of 1316	4652	lol.exe	88
PID 4652 wrote to memory of 1316	4652	lol.exe	88
PID 4652 wrote to memory of 1316	4652	lol.exe	88
PID 4652 wrote to memory of 4876	4652	lol.exe	89
PID 4652 wrote to memory of 4876	4652	lol.exe	89
PID 4652 wrote to memory of 4876	4652	lol.exe	89
PID 4652 wrote to memory of 2888	4652	lol.exe	90
PID 4652 wrote to memory of 2888	4652	lol.exe	90
PID 4652 wrote to memory of 2888	4652	lol.exe	90

C:\Users\Admin\AppData\Local\Temp\lol.exe
"C:\Users\Admin\AppData\Local\Temp\lol.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4652
- C:\Users\Admin\AppData\Local\Temp\lol.exe
  C:\Users\Admin\AppData\Local\Temp\lol.exe /stext "C:\Users\Admin\AppData\Local\Temp\twjrlnfvuxyuzaujvyzgpjmk"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:1316
- C:\Users\Admin\AppData\Local\Temp\lol.exe
  C:\Users\Admin\AppData\Local\Temp\lol.exe /stext "C:\Users\Admin\AppData\Local\Temp\dqokmfpxifqhboinmjmisoytrgt"
  2⤵
  - Accesses Microsoft Outlook accounts
  - System Location Discovery: System Language Discovery
  PID:4876
- C:\Users\Admin\AppData\Local\Temp\lol.exe
  C:\Users\Admin\AppData\Local\Temp\lol.exe /stext "C:\Users\Admin\AppData\Local\Temp\gttcmyaqenimmuerwuzbdbtkzncywbs"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2888

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
f8a81a73b2eb27fa686f808b32662c91

SHA1
2d1dc1d58b268b870c0eb982a58990c7f7ee04f4

SHA256
c07652938b1dc99a6a0d400f3a0740eb82c2c8090e5be8e5db833466d98f53e6

SHA512
b9154fd32ffcc65a706e2d1fcc4ef2e2c1ff19d0565d5d1517c4b237e0173feea254d2e3db74e823ac4a1a69df943c9c6401b24263a02b4885719740f00e9798

Download Submit
C:\Users\Admin\AppData\Local\Temp\twjrlnfvuxyuzaujvyzgpjmk

Filesize
4KB

MD5
c0ab2847671ed5375328c5127a02cc72

SHA1
dc2bcb51562fb17e5c8787833bc0181d88a5b75e

SHA256
e961f466a0638bc99182d0056245e2d8bf1ccc13a189b802aada981f379e2384

SHA512
0b8b634d21ac71e02cef86687bf84b6fcecfd24dafab8130f42ce8b4b3f308a2e1b1fa7bf8d37f2eda76efae2b30b8d39f41d808d771562d8545ed144241924f

Download Submit
memory/1316-6-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1316-14-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1316-27-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1316-1-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1316-11-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2888-5-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2888-12-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2888-16-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2888-24-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2888-8-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4652-35-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/4652-30-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/4652-34-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/4652-33-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/4652-37-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/4876-13-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4876-20-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4876-10-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4876-15-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4876-4-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download

Analysis

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