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Detection rules › Sigma

Publisher Attachment File Dropped In Suspicious Location

Severity
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Source
upstream

Detects creation of files with the ".pub" extension in suspicious or uncommon locations. This could be a sign of attackers abusing Publisher documents

Event coverage

ProviderEvent IDTitle
Sysmon11FileCreate

Stages and Predicates

Stage 1: selection

or:
TargetFilename|contains: 'C:\Temp\'
TargetFilename|contains: '\AppData\Local\Temp\'
TargetFilename|contains: '\Users\Public\'
TargetFilename|contains: '\Windows\Temp\'
TargetFilename|endswith: .pub

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.

FieldKindValues
TargetFilenameends_with
  • .pub
TargetFilenamematch
  • C:\Temp\
  • \AppData\Local\Temp\ corpus 11 (sigma 11)
  • \Users\Public\ corpus 2 (sigma 2)
  • \Windows\Temp\ corpus 3 (sigma 3)