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MALPEDIA_Win_Kamasers_Auto

autogenerated rule brought to you by yara-signator

MalwareKamasersMalpedia 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: Kamasers.

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

Summary generated from the rule's metadata and condition.

Rule source

win-kamasers-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Kamasers_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "3b19f2a2-f834-5986-87b3-120904da4663"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.kamasers"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.kamasers_auto.yar#L1-L132"
		license_url = "N/A"
		logic_hash = "f8e19ef3eb026c9a0c5c914bae604bfdcd7d4c89fa2663538a65855ee39a7abe"
		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 = { e8???????? 8b4db8 46 41 eb75 6a0c 8bcf }
		$sequence_1 = { 8b07 8bcf ff5008 837df00f 8d4604 0f57c0 }
		$sequence_2 = { 52 e8???????? 83c408 8b856cffffff c78510feffff00000000 c78514feffff0f000000 c68500feffff00 }
		$sequence_3 = { 8bf9 ba11000000 8bc7 2bf7 0f1107 c6471000 0f1f00 }
		$sequence_4 = { c78508feffff03000000 c60053 398d0cfeffff 0f4785f8fdffff c6400165 8d85f8fdffff 398d0cfeffff }
		$sequence_5 = { 66f3ab 8b7df0 8b4d10 2bf9 8d047d02000000 8b7df8 50 }
		$sequence_6 = { 8bd9 895dec 8b450c 8bc8 8b7508 2bce 8945f0 }
		$sequence_7 = { 8b0d???????? 49 890d???????? 89048d947df904 5d c3 55 }
		$sequence_8 = { 83c404 ba???????? 8bc8 e8???????? c645fc1c 8b8dc8fdffff }
		$sequence_9 = { 0f87ef010000 ff2485e19df604 8b7e08 33c0 884638 384714 7507 }

	condition:
		7 of them and filesize < 906240
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e8???????? 8b4db8 46 41 eb75 6a0c 8bcf }
$sequence_1hex{ 8b07 8bcf ff5008 837df00f 8d4604 0f57c0 }
$sequence_2hex{ 52 e8???????? 83c408 8b856cffffff c78510feffff00000000 c78514feffff0f000000 c68500feffff00 }
$sequence_3hex{ 8bf9 ba11000000 8bc7 2bf7 0f1107 c6471000 0f1f00 }
$sequence_4hex{ c78508feffff03000000 c60053 398d0cfeffff 0f4785f8fdffff c6400165 8d85f8fdffff 398d0cfeffff }
$sequence_5hex{ 66f3ab 8b7df0 8b4d10 2bf9 8d047d02000000 8b7df8 50 }
$sequence_6hex{ 8bd9 895dec 8b450c 8bc8 8b7508 2bce 8945f0 }
$sequence_7hex{ 8b0d???????? 49 890d???????? 89048d947df904 5d c3 55 }
$sequence_8hex{ 83c404 ba???????? 8bc8 e8???????? c645fc1c 8b8dc8fdffff }
$sequence_9hex{ 0f87ef010000 ff2485e19df604 8b7e08 33c0 884638 384714 7507 }

Condition

7 of them and filesize < 906240

In plain words (Heuristic)

  • The file must be smaller than 906240 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

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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: 3b19f2a2-f834-5986-87b3-120904da4663

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