remcos | 918dede163276d652ee3fc92b2ec93733850b27a31339e6e972536d168990506

Analysis

max time kernel
148s
max time network
150s
platform
windows7_x64
resource
win7-20240611-en
resource tags

arch:x64arch:x86image:win7-20240611-enlocale:en-usos:windows7-x64system
submitted
02/07/2024, 17:06

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General

Target
2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
Size 234KB
Sample240702-vmv3qssfja
SHA256 918dede163276d652ee3fc92b2ec93733850b27a31339e6e972536d168990506
MD5 2021fec8feb356edbcea0588a270cb6b
SHA1 2e1ff93fe5da8c89508ff5f1aa44d641e25b6823
SHA512 2598edb08e125bea4016c44385b29c244f24914fdcdc07546c599e3caf68346bd511853ca1422d4ba9019c21c16ccc33201f6495b9c4a22769df1ff33d4d82c2
SSDEEP 3072:yBkfJpRXATwMdFCcM6FbyDiEDlL1UPhrXiTWddkDdvXIYCZ9gn/TOnG7kUeOp+L2:yqjIGQyDid5ryTWdAIRrgrlk++LbH9Et
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos excel-logs persistence rat

Malware Config

Extracted

Family

remcos

Version

2.7.2 Pro

Botnet

Excel-logs

103.114.106.35:20987

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
Excel.exe
copy_folder
Excel
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
Excel
keylog_path
%AppData%
mouse_option
false
mutex
Excel-KW0C5C
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Excel
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
2448	Excel.exe
2392	Excel.exe

Loads dropped DLL 6 IoCs

pid	Process
1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
2580	cmd.exe
2448	Excel.exe
2448	Excel.exe
2448	Excel.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-39690363-730359138-1046745555-1000\Software\Microsoft\Windows\CurrentVersion\Run\name = "C:\\Users\\Admin\\AppData\\Roaming\\folder\\file.exe"	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-39690363-730359138-1046745555-1000\Software\Microsoft\Windows\CurrentVersion\Run\Excel = "\"C:\\Users\\Admin\\AppData\\Roaming\\Excel\\Excel.exe\""	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-39690363-730359138-1046745555-1000\Software\Microsoft\Windows\CurrentVersion\Run\Excel = "\"C:\\Users\\Admin\\AppData\\Roaming\\Excel\\Excel.exe\""	Excel.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1704 set thread context of 3048	1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	28
PID 2448 set thread context of 2392	2448	Excel.exe	33

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

NSIS installer 2 IoCs

installer

resource	yara_rule
behavioral1/files/0x000800000001454e-27.dat	nsis_installer_1
behavioral1/files/0x000800000001454e-27.dat	nsis_installer_2

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
2448	Excel.exe
2448	Excel.exe
2448	Excel.exe
2448	Excel.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
2448	Excel.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2392	Excel.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 1704 wrote to memory of 3048	1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	28
PID 1704 wrote to memory of 3048	1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	28
PID 1704 wrote to memory of 3048	1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	28
PID 1704 wrote to memory of 3048	1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	28
PID 1704 wrote to memory of 3048	1704	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	28
PID 3048 wrote to memory of 2656	3048	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	29
PID 3048 wrote to memory of 2656	3048	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	29
PID 3048 wrote to memory of 2656	3048	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	29
PID 3048 wrote to memory of 2656	3048	2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe	29
PID 2656 wrote to memory of 2580	2656	WScript.exe	30
PID 2656 wrote to memory of 2580	2656	WScript.exe	30
PID 2656 wrote to memory of 2580	2656	WScript.exe	30
PID 2656 wrote to memory of 2580	2656	WScript.exe	30
PID 2580 wrote to memory of 2448	2580	cmd.exe	32
PID 2580 wrote to memory of 2448	2580	cmd.exe	32
PID 2580 wrote to memory of 2448	2580	cmd.exe	32
PID 2580 wrote to memory of 2448	2580	cmd.exe	32
PID 2448 wrote to memory of 2392	2448	Excel.exe	33
PID 2448 wrote to memory of 2392	2448	Excel.exe	33
PID 2448 wrote to memory of 2392	2448	Excel.exe	33
PID 2448 wrote to memory of 2392	2448	Excel.exe	33
PID 2448 wrote to memory of 2392	2448	Excel.exe	33

C:\Users\Admin\AppData\Local\Temp\2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1704
- C:\Users\Admin\AppData\Local\Temp\2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\2021fec8feb356edbcea0588a270cb6b_JaffaCakes118.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:3048
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2656
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Excel\Excel.exe"
      4⤵
      Loads dropped DLL
      Suspicious use of WriteProcessMemory
      PID:2580
    - - C:\Users\Admin\AppData\Roaming\Excel\Excel.exe
        
        C:\Users\Admin\AppData\Roaming\Excel\Excel.exe
        5⤵
        Executes dropped EXE
        Loads dropped DLL
        Suspicious use of SetThreadContext
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: MapViewOfSection
        Suspicious use of WriteProcessMemory
        
        PID:2448
      - C:\Users\Admin\AppData\Roaming\Excel\Excel.exe
        
        C:\Users\Admin\AppData\Roaming\Excel\Excel.exe
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetWindowsHookEx
        
        PID:2392

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

0jxlr2n3sx9a9r.dll

Path C:\Users\Admin\AppData\Local\Temp\0jxlr2n3sx9a9r.dll
Size 13KB
SHA256 238727a5364853abf73decbd56c4c1e3f3906060e802352b547a296e34dd3646
MD5 9ec36c1f7989533c81de064104ea35ab
SHA1 9a9f608e7bf4e4f06e4804f7b132939d3ee5654d
SHA512 bfb31fd814d2069cf529297c9c4ec4b8d6480012ccbc8f0ea013ce750705d953e47f00f6fa625b95c94c1bcde6763612a6055f91a35428eed0f1e16c6b1bb2e7
SSDEEP 192:hRg35IFoT8RdxD2I9fWJDbHifEePOZEyIDcseAFMbUsE80I/uCg:IIbCMedaBQ3sfFMZE806
MD5 SHA1 SHA512 SSDEEP

Submit Download

install.vbs

Path C:\Users\Admin\AppData\Local\Temp\install.vbs
Size 414B
SHA256 358585a15d72ce0478be92c97b940accf7f7717bf77c29967d4a6fa853f879b2
MD5 53c0ff348853d6380df0b8c16a03d762
SHA1 eda6327849c2c83520e527241156fad9fa634b4a
SHA512 925c2286fd0a370afa3d91d94b503ed01f77467fd2a13edca2e940ee4e8f9420193c9a70a3af0a8b26e62e6c2bd7cf1911059c273f16dc4bf261d54b0f840737
MD5 SHA1 SHA512

Submit Download

logs.dat

Path C:\Users\Admin\AppData\Roaming\Excel\logs.dat
Size 74B
SHA256 f0113b81310adf75ed34ce6ae01279af9c66570e57dbcd2fc1786a6f68b5939a
MD5 8d7c6573a29d421a6e76a94242c535bc
SHA1 0817fcaf1fb36bd56efb4ccd15680c95e02c9e39
SHA512 eca02e8b0db246c8c2fb95e5774da47d420fc66654b4384d81294e0a689b5a3be257da039f635f4942cdea468b02ea59be8653a337520c100c559c6e6bed6e3c
MD5 SHA1 SHA512

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System.dll

Path \Users\Admin\AppData\Local\Temp\nsj781E.tmp\System.dll
Size 11KB
SHA256 6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e
MD5 fccff8cb7a1067e23fd2e2b63971a8e1
SHA1 30e2a9e137c1223a78a0f7b0bf96a1c361976d91
SHA512 f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c
SSDEEP 192:xPtkiQJr7V9r3HcU17S8g1w5xzWxy6j2V7i77blbTc4v:g7VpNo8gmOyRsVc4
MD5 SHA1 SHA512 SSDEEP

Submit Download

Excel.exe

Path \Users\Admin\AppData\Roaming\Excel\Excel.exe
Size 234KB
SHA256 918dede163276d652ee3fc92b2ec93733850b27a31339e6e972536d168990506
MD5 2021fec8feb356edbcea0588a270cb6b
SHA1 2e1ff93fe5da8c89508ff5f1aa44d641e25b6823
SHA512 2598edb08e125bea4016c44385b29c244f24914fdcdc07546c599e3caf68346bd511853ca1422d4ba9019c21c16ccc33201f6495b9c4a22769df1ff33d4d82c2
SSDEEP 3072:yBkfJpRXATwMdFCcM6FbyDiEDlL1UPhrXiTWddkDdvXIYCZ9gn/TOnG7kUeOp+L2:yqjIGQyDid5ryTWdAIRrgrlk++LbH9Et
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1704-12-0x00000000752E0000-0x00000000752E8000-memory.dmp

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memory/1704-16-0x00000000752E0000-0x00000000752E8000-memory.dmp

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memory/2392-48-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2392-66-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2392-81-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2392-77-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2392-49-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2392-52-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2392-55-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2392-59-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2392-71-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2392-63-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2448-44-0x00000000750A0000-0x00000000750A8000-memory.dmp

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memory/2448-53-0x00000000750A0000-0x00000000750A8000-memory.dmp

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memory/3048-17-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/3048-15-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/3048-25-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/3048-20-0x0000000000400000-0x0000000000421000-memory.dmp

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