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SEKOIA_Hacktool_Mimikat_Ssp_Strings

Detects mimikat_ssp

Hack toolSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-11-22
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects mimikat_ssp

Targets: Windows PE.

It defines 4 patterns (4 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

hacktool-mimikat-ssp-strings.yarDetection Rule License 1.1
rule SEKOIA_Hacktool_Mimikat_Ssp_Strings : FILE
{
	meta:
		description = "Detects mimikat_ssp"
		author = "Sekoia.io"
		id = "33b3620f-e02d-4d29-adcc-fea3b49ab780"
		date = "2023-11-22"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/hacktool_mimikat_ssp_strings.yar#L1-L20"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "06325bf495963db90b14fb16a5f3eafda9e4554f753d04405af51c6041a9b166"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "[*] Building RPC packet" ascii
		$ = "[*] Connecting to lsasspirpc RPC service" ascii
		$ = "[*] Sending SspirConnectRpc call" ascii
		$ = "[*] Sending SspirCallRpc call" ascii

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 500KB and all of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$text"[*] Building RPC packet"ascii
$text"[*] Connecting to lsasspirpc RPC service"ascii
$text"[*] Sending SspirConnectRpc call"ascii
$text"[*] Sending SspirCallRpc call"ascii

Condition

uint16be( 0 ) == 0x4d5a and filesize < 500KB and all of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 500KB (a cheap guard that skips large files).
  • All patterns in the rule must match.

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References

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 33b3620f-e02d-4d29-adcc-fea3b49ab780

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE