Skip to content

YARA · SEKOIA.IO Community

SEKOIA_Apt_Cerana_Keeper_Dropboxflop

Detects DropboxFlop malware

APT / threat actorSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2024-10-04
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects DropboxFlop malware

Targets: Windows PE.

It defines 1 patterns (1 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

apt-cerana-keeper-dropboxflop.yarDetection Rule License 1.1
rule SEKOIA_Apt_Cerana_Keeper_Dropboxflop : FILE
{
	meta:
		description = "Detects DropboxFlop malware"
		author = "Sekoia.io"
		id = "e077901f-3847-45f3-82cb-d52724cd3fb5"
		date = "2024-10-04"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_cerana_keeper_dropboxflop.yar#L1-L17"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "2b65b74e52fbf25cb400dbdfcd1a06a7"
		logic_hash = "5b2dfdf0c35f574e7006bb3e6eafa10d0e7fc7d980d443b31d4d6d6b7cec2fce"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "<assemblyIdentity type=\"win32\" name=\"dropboxflop\""

	condition:
		uint16be( 0 ) == 0x4d5a and all of them
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$text"<assemblyIdentity type=\"win32\" name=\"dropboxflop\""

Condition

uint16be( 0 ) == 0x4d5a and all of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

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

Open in editor

References

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 2b65b74e52fbf25cb400dbdfcd1a06a7

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: e077901f-3847-45f3-82cb-d52724cd3fb5

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE