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MALPEDIA_Win_Webc2_Bolid_Auto

autogenerated rule brought to you by yara-signator

MalwareWebc2 BolidMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
Author
Felix Bilstein - yara-signator at cocacoding dot com
Date
2026-05-04
Modified
2026-05-18
Score / Quality
75 / 75

What this rule detects

autogenerated rule brought to you by yara-signator

Associated malware family: Webc2 Bolid.

It defines 10 patterns (0 text, 10 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-webc2-bolid-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Bolid_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "716ef3b0-82d3-51b2-853d-5eec600e9585"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_bolid"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_bolid_auto.yar#L1-L125"
		license_url = "N/A"
		logic_hash = "ea324af3e8557090b9806bb3099e79345357ea9abb6340eef576f2e3b10a818a"
		score = 75
		quality = 75
		tags = "FILE"
		version = "1"
		tool = "yara-signator v0.6.0"
		signator_config = "callsandjumps;datarefs;binvalue"
		malpedia_rule_date = "20260422"
		malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
		malpedia_version = "20260504"
		malpedia_license = "CC BY-SA 4.0"
		malpedia_sharing = "TLP:WHITE"

	strings:
		$sequence_0 = { 7445 8b4dc4 8bd6 c1e204 03d1 8d8558ffffff 52 }
		$sequence_1 = { f7d1 49 51 68???????? 8d8d78ffffff e8???????? }
		$sequence_2 = { 8841ff b001 eb30 49 51 }
		$sequence_3 = { 0f85db000000 6a01 8d4d88 c645fc0f e8???????? 6a01 }
		$sequence_4 = { e8???????? 83c404 8b4df4 5f 5e 32c0 64890d00000000 }
		$sequence_5 = { c645fc16 c6451b5c e8???????? 8d4dd0 }
		$sequence_6 = { 8b4f08 3bc8 7305 e8???????? 8bcf e8???????? 8b4708 }
		$sequence_7 = { 8bf1 89742408 c706???????? 8b4644 33db 3bc3 }
		$sequence_8 = { 83e203 83f908 7229 f3a5 ff2495b8734000 8bc7 ba03000000 }
		$sequence_9 = { 895c2434 8d4c2428 8d54244c 51 c68424000200000c 83ec10 }

	condition:
		7 of them and filesize < 163840
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 7445 8b4dc4 8bd6 c1e204 03d1 8d8558ffffff 52 }
$sequence_1hex{ f7d1 49 51 68???????? 8d8d78ffffff e8???????? }
$sequence_2hex{ 8841ff b001 eb30 49 51 }
$sequence_3hex{ 0f85db000000 6a01 8d4d88 c645fc0f e8???????? 6a01 }
$sequence_4hex{ e8???????? 83c404 8b4df4 5f 5e 32c0 64890d00000000 }
$sequence_5hex{ c645fc16 c6451b5c e8???????? 8d4dd0 }
$sequence_6hex{ 8b4f08 3bc8 7305 e8???????? 8bcf e8???????? 8b4708 }
$sequence_7hex{ 8bf1 89742408 c706???????? 8b4644 33db 3bc3 }
$sequence_8hex{ 83e203 83f908 7229 f3a5 ff2495b8734000 8bc7 ba03000000 }
$sequence_9hex{ 895c2434 8d4c2428 8d54244c 51 c68424000200000c 83ec10 }

Condition

7 of them and filesize < 163840

In plain words (Heuristic)

  • The file must be smaller than 163840 (a cheap guard that skips large files).
  • At least 7 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

Licence & attribution

Author: Felix Bilstein - yara-signator at cocacoding dot com

Source repository: Malpedia signator rules @ c901f97b7d

Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)

Original rule

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

Rule id: 716ef3b0-82d3-51b2-853d-5eec600e9585

Metadata

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE