Copy From Or To Admin Share Or Sysvol Folder

Severity: medium
Author: Florian Roth (Nextron Systems), oscd.community, Teymur Kheirkhabarov @HeirhabarovT, Zach Stanford @svch0st, Nasreddine Bencherchali
Source: upstream

Detects a copy command or a copy utility execution to or from an Admin share or remote

MITRE ATT&CK coverage

Tactic	Techniques
Lateral Movement	`T1021.002` Remote Services: SMB/Windows Admin Shares
Collection	`T1039` Data from Network Shared Drive
Exfiltration	`T1048` Exfiltration Over Alternative Protocol

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `selection_target`

or:
CommandLine|contains: '\Sysvol\'
CommandLine|contains: '\\\\*\\*$'

Stage 2: `selection_other_tools`

or:
Image|endswith: '\robocopy.exe'
Image|endswith: '\xcopy.exe'
OriginalFileName: XCOPY.EXE
OriginalFileName: robocopy.exe

Stage 3: `all of selection_cmd_img`

or:
Image|endswith: '\cmd.exe'
OriginalFileName: Cmd.Exe

Stage 4: `all of selection_cmd_cli`

CommandLine|contains: copy

Stage 5: `all of selection_pwsh_img`

or:
Image|contains: '\powershell.exe'
Image|contains: '\powershell_ise.exe'
Image|contains: '\pwsh.exe'
OriginalFileName: PowerShell.EXE
OriginalFileName: powershell_ise.exe
OriginalFileName: pwsh.dll

Stage 6: `all of selection_pwsh_cli`

or:
CommandLine|contains: ' cp '
CommandLine|contains: ' mi '
CommandLine|contains: ' move-item'
CommandLine|contains: ' mv '
CommandLine|contains: 'copy '
CommandLine|contains: copy-item
CommandLine|contains: 'cpi '
CommandLine|contains: 'move '

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`CommandLine`	match	`cp` corpus 5 (sigma 5) `mi` corpus 2 (sigma 2) `move-item` `mv` corpus 2 (sigma 2) `\Sysvol\` `\\\\\\$` `copy` corpus 3 (sigma 3) `copy` corpus 11 (sigma 11) `copy-item` corpus 4 (sigma 4) `cpi` corpus 4 (sigma 4) `move` corpus 2 (sigma 2)
`Image`	ends_with	`\cmd.exe` corpus 92 (sigma 92) `\robocopy.exe` corpus 5 (sigma 5) `\xcopy.exe` corpus 5 (sigma 5)
`Image`	match	`\powershell.exe` `\powershell_ise.exe` `\pwsh.exe` corpus 2 (sigma 2)
`OriginalFileName`	eq	`Cmd.Exe` corpus 32 (sigma 30, splunk 2) `PowerShell.EXE` corpus 64 (sigma 60, splunk 4) `XCOPY.EXE` corpus 4 (sigma 4) `powershell_ise.exe` corpus 6 (sigma 6) `pwsh.dll` corpus 72 (sigma 68, splunk 4) `robocopy.exe` corpus 4 (sigma 4)

Copy From Or To Admin Share Or Sysvol Folder

MITRE ATT&CK coverage

Event coverage

Stages and Predicates

Stage 1: selection_target

Stage 2: selection_other_tools

Stage 3: all of selection_cmd_img

Stage 4: all of selection_cmd_cli

Stage 5: all of selection_pwsh_img