remcos | 55f56d52f1ec61b40661c3a43dacd880f3c324040b2185808988d027960c211a

General

Target

REVCCF_decoded.exe
Size

483KB
MD5

abbcfae8e387c0dd91bdc0963ffc2cea
SHA1

7ad49bcfd2643b23fd61a320657807121fdfc6dc
SHA256

55f56d52f1ec61b40661c3a43dacd880f3c324040b2185808988d027960c211a
SHA512

ad470a88fde992231c7b8dd151e7733ffe5eaf8c95acb08e877ede7de694860ef0db76176b85f83cc9b6bf765f6571ef04de3b7551545aa489ee760399ae4c74
SSDEEP

6144:ZTz+c6KHYBhDc1RGJdv//NkUn+N5Bkf/0TELRvIZPjbsAOZZmAX4crgT4:ZTlrYw1RUh3NFn+N5WfIQIjbs/ZmHT4

Score

10^/10

remcos remotehost collection discovery rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

hugobus.duckdns.org:2409

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-7MTCX4
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

Detected Nirsoft tools 8 IoCs

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

resource	yara_rule
behavioral2/memory/1688-11-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/972-16-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/972-25-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4924-23-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/1688-15-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/4924-10-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/972-14-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1688-27-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4924-23-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/4924-10-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/1688-11-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1688-15-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1688-27-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	REVCCF_decoded.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 5004 set thread context of 1688	5004	REVCCF_decoded.exe	93
PID 5004 set thread context of 4924	5004	REVCCF_decoded.exe	94
PID 5004 set thread context of 972	5004	REVCCF_decoded.exe	95

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

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1688	REVCCF_decoded.exe
1688	REVCCF_decoded.exe
972	REVCCF_decoded.exe
972	REVCCF_decoded.exe
1688	REVCCF_decoded.exe
1688	REVCCF_decoded.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
5004	REVCCF_decoded.exe
5004	REVCCF_decoded.exe
5004	REVCCF_decoded.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	972	REVCCF_decoded.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 5004 wrote to memory of 1688	5004	REVCCF_decoded.exe	93
PID 5004 wrote to memory of 1688	5004	REVCCF_decoded.exe	93
PID 5004 wrote to memory of 1688	5004	REVCCF_decoded.exe	93
PID 5004 wrote to memory of 4924	5004	REVCCF_decoded.exe	94
PID 5004 wrote to memory of 4924	5004	REVCCF_decoded.exe	94
PID 5004 wrote to memory of 4924	5004	REVCCF_decoded.exe	94
PID 5004 wrote to memory of 972	5004	REVCCF_decoded.exe	95
PID 5004 wrote to memory of 972	5004	REVCCF_decoded.exe	95
PID 5004 wrote to memory of 972	5004	REVCCF_decoded.exe	95

C:\Users\Admin\AppData\Local\Temp\REVCCF_decoded.exe
"C:\Users\Admin\AppData\Local\Temp\REVCCF_decoded.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:5004
- C:\Users\Admin\AppData\Local\Temp\REVCCF_decoded.exe
  C:\Users\Admin\AppData\Local\Temp\REVCCF_decoded.exe /stext "C:\Users\Admin\AppData\Local\Temp\sotviouqtodtmmbi"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:1688
- C:\Users\Admin\AppData\Local\Temp\REVCCF_decoded.exe
  C:\Users\Admin\AppData\Local\Temp\REVCCF_decoded.exe /stext "C:\Users\Admin\AppData\Local\Temp\cqznjgnspwvgxsxmard"
  2⤵
  - Accesses Microsoft Outlook accounts
  - System Location Discovery: System Language Discovery
  PID:4924
- C:\Users\Admin\AppData\Local\Temp\REVCCF_decoded.exe
  C:\Users\Admin\AppData\Local\Temp\REVCCF_decoded.exe /stext "C:\Users\Admin\AppData\Local\Temp\nlmykzxmdenlzglyjbqbjfa"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:972

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:\Users\Admin\AppData\Local\Temp\sotviouqtodtmmbi

Filesize
4KB

MD5
f1d2c01ce674ad7d5bad04197c371fbc

SHA1
4bf0ed04d156a3dc6c8d27e134ecbda76d3585aa

SHA256
25b006032deccd628940ef728fffe83b325a85de453a34691f55f570e4460094

SHA512
81cb982cc33dcc27600a8a681c3ec3cc5b9221b95baa45e1ab24479745a9638b9f31d7beeeb1128b3294ff69b44e958c75e25d565f66790c364665caff96ee77

Download Submit
memory/972-16-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/972-7-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/972-25-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/972-13-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/972-14-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1688-27-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1688-11-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1688-1-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1688-15-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1688-5-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4924-23-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4924-10-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4924-8-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4924-9-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/4924-3-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/5004-30-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/5004-36-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/5004-35-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/5004-34-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/5004-33-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/5004-37-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/5004-38-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download

Analysis

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