MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b6cd42853c9f137da206ed6dfd50f8b2d1e02c11279893410ff410a9bd505682. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry

KoiLoader

Vendor detections: 16

Intelligence 16 IOCs YARA 4 File information Comments

SHA256 hash:	b6cd42853c9f137da206ed6dfd50f8b2d1e02c11279893410ff410a9bd505682
SHA3-384 hash:	fb02d3a63ff899c42738038b1dc880ea6f606789db51b1b4823dcb083259e2dc8bbea993be37a8f3bca24e3327135d97
SHA1 hash:	8c10f3727dc912a985181eaf8cf7b6e585c040bb
MD5 hash:	d00c83d7c1ab5910961439e14bb3032f
humanhash:	kilo-seventeen-idaho-lithium
File name:	causativenesszb.exe
Download:	download sample
Signature	KoiLoader Create hunting rule
File size:	185'344 bytes
First seen:	2024-06-03 22:00:46 UTC
Last seen:	2024-06-05 10:39:21 UTC
File type:	exe
MIME type:	application/x-dosexec
imphash	66deda4204cb009d8c01c3f28c17567f (34 x KoiLoader, 2 x AZORult)
ssdeep	3072:nCmlA+2TGMF85+bkRG32foUP9GmPe97UoY6SvZxMkVF79j1xZrU2CsOcQ2nj/NZ:CmlV4h8JG3QUzbScbSJQ2j/NZ
TLSH	T1A6048C6171C4C03ADC7324724AB1A1987E3CF7F85B7559FF338C0BAE4AA09915D229B9
TrID	40.3% (.EXE) Win64 Executable (generic) (10523/12/4) 19.3% (.EXE) Win16 NE executable (generic) (5038/12/1) 17.2% (.EXE) Win32 Executable (generic) (4504/4/1) 7.7% (.EXE) OS/2 Executable (generic) (2029/13) 7.6% (.EXE) Generic Win/DOS Executable (2002/3)
Reporter	V3n0mStrike
Tags:	81-19-141-115 dsestimation-com exe KoiLoader

Intelligence

File Origin

# of uploads :

# of downloads :

510

Origin country :

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

b6cd42853c9f137da206ed6dfd50f8b2d1e02c11279893410ff410a9bd505682.exe

Verdict:

Suspicious activity

Analysis date:

2024-06-03 22:02:45 UTC

Tags:

n/a

Link:

https://app.any.run/tasks/b48e4750-bfb7-45cb-82cc-8567ac85dcc2

Note:

ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample

Detection(s):

SecuriteInfo.com.Win32.TrojanX-gen.8594.1175.UNOFFICIAL

Verdict:

Malicious

Score:

92.5%

Link:

https://cyber-fortress.com/docs/result/index.php?id=665e45ebab69e84d6a2f495cwin7simulatehigh_evasion

Tags:

Kryptik

Result

Verdict:

Clean

Maliciousness:

Verdict:

No Threat

Threat level:

10/10

Confidence:

100%

Tags:

epmicrosoft_visual_cc microsoft_visual_cc

Link:

https://www.filescan.io/uploads/665e3d2249a1c83062655ae3/reports/a24f8800-e2ff-4b4a-9424-55477a6722a8/overview

Verdict:

Malicious

Labled as:

Win/malicious_confidence_90%

Link:

https://www.hybrid-analysis.com/sample/b6cd42853c9f137da206ed6dfd50f8b2d1e02c11279893410ff410a9bd505682

Result

Verdict:

MALICIOUS

Details

Windows PE Executable

Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.

Malware family:

Kpot stealer

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/42d62c4a-0dbf-438f-9162-37b20d30bcb7

Result

Threat name:

AZORult++

Detection:

malicious

Classification:

bank.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1451383

Signature

AI detected suspicious sample

Antivirus / Scanner detection for submitted sample

Contain functionality to detect virtual machines

Contains functionality to bypass UAC (CMSTPLUA)

Contains functionality to compare user and computer (likely to detect sandboxes)

Contains functionality to inject code into remote processes

Detected AZORult++ Trojan

Found evasive API chain (may stop execution after checking locale)

Found evasive API chain (may stop execution after checking mutex)

Machine Learning detection for sample

Malicious sample detected (through community Yara rule)

Yara detected UAC Bypass using CMSTP

Behaviour

Behavior Graph:

Download SVG

Score:

99%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/b6cd42853c9f137da206ed6dfd50f8b2d1e02c11279893410ff410a9bd505682

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/b6cd42853c9f137da206ed6dfd50f8b2d1e02c11279893410ff410a9bd505682/

Threat name:

Win32.Trojan.Koiloader

Status:

Malicious

First seen:

2024-06-03 22:01:05 UTC

File Type:

PE (Exe)

Extracted files:

AV detection:

28 of 38 (73.68%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=w3gufbj4t4jx3iqg5vw72uhywli6alare6mjgqip6qiktpkqk2ba._file

Verdict:

malicious

Result

Malware family:

koiloader

Score:

10/10

Tags:

family:koiloader loader

Link:

https://tria.ge/reports/240603-1w7e1sae8y/

Behaviour

Detects KoiLoader payload

KoiLoader

Malware Config

C2 Extraction:

http://81.19.141.115/marasmus.php

Verdict:

Suspicious

Tags:

n/a

YARA:

n/a

Link:

https://app.threat.zone/submission/6e5b2831-b30a-4ff9-a148-8cbcba17946b

Unpacked files

SH256 hash:

f03d21ad95ccab577cba5e25b4d5fb9f884e1422cd6566ddda1e7faef2f4b08c

MD5 hash:

7cdf012db2b973be17ccc03a134579f6

SHA1 hash:

78d943829619d014f0c65567eb587a5bdd601ec1

Detections:

INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM

Link:

https://www.unpac.me/results/2c4a69e3-1bc6-454c-b735-67771300caa4/

SH256 hash:

b6cd42853c9f137da206ed6dfd50f8b2d1e02c11279893410ff410a9bd505682

MD5 hash:

d00c83d7c1ab5910961439e14bb3032f

SHA1 hash:

8c10f3727dc912a985181eaf8cf7b6e585c040bb

Link:

https://www.unpac.me/results/2c4a69e3-1bc6-454c-b735-67771300caa4/

Please note that we are no longer able to provide a coverage score for Virus Total.

Threat name:

Malicious File

Score:

1.00

Link:

https://yomi.yoroi.company/submissions/b6cd42853c9f137da206ed6dfd50f8b2d1e02c11279893410ff410a9bd505682

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:	cobalt_strike_tmp01925d3f Create hunting rule
Author:	The DFIR Report
Description:	files - file ~tmp01925d3f.exe
Reference:	https://thedfirreport.com

Rule name:	DebuggerCheck__API Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	maldoc_find_kernel32_base_method_1 Create hunting rule
Author:	Didier Stevens (https://DidierStevens.com)

Rule name:	Windows_Generic_Threat_1417511b Create hunting rule
Author:	Elastic Security

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

KoiLoader

exe b6cd42853c9f137da206ed6dfd50f8b2d1e02c11279893410ff410a9bd505682

(this sample)

Delivery method

Distributed via web download

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings

ID	Title	Severity
CHECK_AUTHENTICODE	Missing Authenticode	high
CHECK_DLL_CHARACTERISTICS	Missing dll Security Characteristics (HIGH_ENTROPY_VA)	high

Reviews

ID	Capabilities	Evidence
WIN32_PROCESS_API	Can Create Process and Threads	KERNEL32.dll::CloseHandle
WIN_BASE_API	Uses Win Base API	KERNEL32.dll::TerminateProcess KERNEL32.dll::LoadLibraryExW KERNEL32.dll::GetStartupInfoW KERNEL32.dll::GetCommandLineA KERNEL32.dll::GetCommandLineW
WIN_BASE_EXEC_API	Can Execute other programs	KERNEL32.dll::WriteConsoleW KERNEL32.dll::SetStdHandle KERNEL32.dll::GetConsoleMode KERNEL32.dll::GetConsoleOutputCP
WIN_BASE_IO_API	Can Create Files	KERNEL32.dll::CreateFileW

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