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YARA · SEKOIA.IO Community

SEKOIA_Apt_Toddycat_Toddybox_Strings

Detects ToddyCat's ToddyBox binary

APT / threat actorSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-11-20
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects ToddyCat's ToddyBox binary

Targets: Windows PE.

It defines 8 patterns (8 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

apt-toddycat-toddybox-strings.yarDetection Rule License 1.1
rule SEKOIA_Apt_Toddycat_Toddybox_Strings : FILE
{
	meta:
		description = "Detects ToddyCat's ToddyBox binary"
		author = "Sekoia.io"
		id = "fde3df24-ebd7-4327-998e-bddaa08835da"
		date = "2023-11-20"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_toddycat_toddybox_strings.yar#L1-L24"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "b71fad12d4485268cbeff98b8a8d6067ac8f62164be60cdb61f3f37ab471a247"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "Wait a while to upload the next file..."
		$ = "[-] Error Msg: %s"
		$ = "[-] Error Msg: Connect Errors or Proxy Errors"
		$ = "[-] arg missing!"
		$ = "[-] Get module dir failed!"
		$ = "[-] Dir error!"
		$ = "Auto Get Proxy %S"
		$ = "Dropbox-API-Arg"

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 1MB and all of them
}

Strings (8 patterns)

IdentifierTypeValueModifiers
$text"Wait a while to upload the next file..."
$text"[-] Error Msg: %s"
$text"[-] Error Msg: Connect Errors or Proxy Errors"
$text"[-] arg missing!"
$text"[-] Get module dir failed!"
$text"[-] Dir error!"
$text"Auto Get Proxy %S"
$text"Dropbox-API-Arg"

Condition

uint16be( 0 ) == 0x4d5a and filesize < 1MB and all of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 1MB (a cheap guard that skips large files).
  • All patterns in the rule must match.

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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

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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: fde3df24-ebd7-4327-998e-bddaa08835da

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE