HackTool - Potential Impacket Lateral Movement Activity

calendar Feb 21, 2023 · attack.execution attack.t1047 attack.lateral_movement attack.t1021.003  ·
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Detects wmiexec/dcomexec/atexec/smbexec from Impacket framework

Sigma rule (View on GitHub)

 1title: HackTool - Potential Impacket Lateral Movement Activity
 2id: 10c14723-61c7-4c75-92ca-9af245723ad2
 3related:
 4    - id: e31f89f7-36fb-4697-8ab6-48823708353b
 5      type: obsoletes
 6status: stable
 7description: Detects wmiexec/dcomexec/atexec/smbexec from Impacket framework
 8references:
 9    - https://github.com/SecureAuthCorp/impacket/blob/8b1a99f7c715702eafe3f24851817bb64721b156/examples/wmiexec.py
10    - https://github.com/SecureAuthCorp/impacket/blob/8b1a99f7c715702eafe3f24851817bb64721b156/examples/atexec.py
11    - https://github.com/SecureAuthCorp/impacket/blob/8b1a99f7c715702eafe3f24851817bb64721b156/examples/smbexec.py
12    - https://github.com/SecureAuthCorp/impacket/blob/8b1a99f7c715702eafe3f24851817bb64721b156/examples/dcomexec.py
13    - https://www.elastic.co/guide/en/security/current/suspicious-cmd-execution-via-wmi.html
14author: Ecco, oscd.community, Jonhnathan Ribeiro, Tim Rauch
15date: 2019/09/03
16modified: 2023/02/21
17tags:
18    - attack.execution
19    - attack.t1047
20    - attack.lateral_movement
21    - attack.t1021.003
22logsource:
23    category: process_creation
24    product: windows
25detection:
26    selection_other:
27        # *** wmiexec.py
28        #    parent is wmiprvse.exe
29        #    examples:
30        #       cmd.exe /Q /c whoami 1> \\127.0.0.1\ADMIN$\__1567439113.54 2>&1
31        #       cmd.exe /Q /c cd  1> \\127.0.0.1\ADMIN$\__1567439113.54 2>&1
32        # *** dcomexec.py -object MMC20
33        #   parent is mmc.exe
34        #   example:
35        #       "C:\Windows\System32\cmd.exe" /Q /c cd  1> \\127.0.0.1\ADMIN$\__1567442499.05 2>&1
36        # *** dcomexec.py -object ShellBrowserWindow
37        #  runs %SystemRoot%\System32\rundll32.exe shell32.dll,SHCreateLocalServerRunDll {c08afd90-f2a1-11d1-8455-00a0c91f3880} but parent command is explorer.exe
38        #  example:
39        #   "C:\Windows\System32\cmd.exe" /Q /c cd \ 1> \\127.0.0.1\ADMIN$\__1567520103.71 2>&1
40        # *** smbexec.py
41        #   parent is services.exe
42        #   example:
43        #       C:\Windows\system32\cmd.exe /Q /c echo tasklist ^> \\127.0.0.1\C$\__output 2^>^&1 > C:\Windows\TEMP\execute.bat & C:\Windows\system32\cmd.exe /Q /c C:\Windows\TEMP\execute.bat & del C:\Windows\TEMP\execute.bat
44        ParentImage|endswith:
45            - '\wmiprvse.exe'        # wmiexec
46            - '\mmc.exe'        # dcomexec MMC
47            - '\explorer.exe'        # dcomexec ShellBrowserWindow
48            - '\services.exe'        # smbexec
49        CommandLine|contains|all:
50            - 'cmd.exe'
51            - '/Q'
52            - '/c'
53            - '\\\\127.0.0.1\\'
54            - '&1'
55    selection_atexec:
56        ParentCommandLine|contains:
57            - 'svchost.exe -k netsvcs'       # atexec on win10 (parent is "C:\Windows\system32\svchost.exe -k netsvcs")
58            - 'taskeng.exe'       # atexec on win7 (parent is "taskeng.exe {AFA79333-694C-4BEE-910E-E57D9A3518F6} S-1-5-18:NT AUTHORITY\System:Service:")
59            # cmd.exe /C tasklist /m > C:\Windows\Temp\bAJrYQtL.tmp 2>&1
60        CommandLine|contains|all:
61            - 'cmd.exe'
62            - '/C'
63            - 'Windows\Temp\'
64            - '&1'
65    condition: 1 of selection_*
66fields:
67    - CommandLine
68    - ParentCommandLine
69falsepositives:
70    - Unknown
71level: high

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