MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ef4948765f8caae1f84b2199e785842e19e49c39630422c12a603c93d3e6b4b4. 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


Formbook


Vendor detections: 18


Intelligence 18 IOCs YARA 21 File information Comments
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SHA256 hash: ef4948765f8caae1f84b2199e785842e19e49c39630422c12a603c93d3e6b4b4
SHA3-384 hash: f1161217df5361f41466d6c69022841aa25ac1e5418954d393d2cc3d97f88fdb5b72bb69a0c3c994f46d4cc772e7501f
SHA1 hash: 161468a441925fe86e2a2d500d85f91d6eeb11e3
MD5 hash: 0be3c2adea2ab8c61cd2121e65e489ff
humanhash: ack-seventeen-tennis-spaghetti
File name:ef4948765f8caae1f84b2199e785842e19e49c39630422c12a603c93d3e6b4b4
Download: download sample
Signature Formbook
Create hunting rule
File size:675'328 bytes
First seen:2025-03-10 12:10:56 UTC
Last seen:2025-03-10 13:10:18 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'740 x AgentTesla, 19'600 x Formbook, 12'241 x SnakeKeylogger)
ssdeep 12288:vj383le9ci4IwuIIwYBt+Kr7Je7PVDQsnEurrVyJYqKgOKAHfp19IEHVN+qmV:vT32JuIcBnr7uPVsNurZcYqKgO5fD9HS
Threatray 4'975 similar samples on MalwareBazaar
TLSH T1AAE4F1483A1AE403D99162F45AA1F2B513791CEDB911E2CF5FD9BDDFB8E6F020A00553
TrID 71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.2% (.EXE) Win64 Executable (generic) (10522/11/4)
6.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.3% (.EXE) Win32 Executable (generic) (4504/4/1)
2.0% (.ICL) Windows Icons Library (generic) (2059/9)
Magika pebin
dhash icon 00404080a0a08000 (13 x SnakeKeylogger, 2 x Formbook, 1 x AgentTesla)
Reporter adrian__luca
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
337
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
ef4948765f8caae1f84b2199e785842e19e49c39630422c12a603c93d3e6b4b4
Verdict:
Malicious activity
Analysis date:
2025-03-10 18:16:36 UTC
Tags:
formbook stealer
Link:
https://app.any.run/tasks/275efd78-6870-413f-abf7-296f45cd5939

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
Score:
96.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=67cededf0d1b39e3a208b972
Tags:
virus micro msil
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Сreating synchronization primitives
Creating a file in the %AppData% directory
Enabling the 'hidden' option for recently created files
Adding an access-denied ACE
Creating a process with a hidden window
Creating a file in the %temp% directory
Launching a process
Creating a file
Launching cmd.exe command interpreter
Setting browser functions hooks
Adding an exclusion to Microsoft Defender
Enabling autorun by creating a file
Unauthorized injection to a system process
Unauthorized injection to a browser process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
obfuscated packed packed packer_detected vbnet
Link:
https://www.filescan.io/uploads/67ced6ece95d0f9029e6cc51/reports/c0d52721-7e65-4bd7-8373-50672fe706ed/overview
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/ef4948765f8caae1f84b2199e785842e19e49c39630422c12a603c93d3e6b4b4
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:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/c7695427-8c21-47c3-b333-5265bc6a73c8
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1634563
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
Allocates memory in foreign processes
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Found direct / indirect Syscall (likely to bypass EDR)
Found malware configuration
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Modifies the prolog of user mode functions (user mode inline hooks)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Performs DNS queries to domains with low reputation
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: CMSTP Execution Process Creation
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Scheduled temp file as task from temp location
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Uses schtasks.exe or at.exe to add and modify task schedules
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1634563 Sample: ysWQ4BqQrF.exe Startdate: 11/03/2025 Architecture: WINDOWS Score: 100 57 www.play-vanguard-nirvana.xyz 2->57 59 www.kpde.xyz 2->59 61 5 other IPs or domains 2->61 81 Suricata IDS alerts for network traffic 2->81 83 Found malware configuration 2->83 85 Malicious sample detected (through community Yara rule) 2->85 89 12 other signatures 2->89 11 ysWQ4BqQrF.exe 7 2->11         started        15 YNfDrfV.exe 5 2->15         started        signatures3 87 Performs DNS queries to domains with low reputation 59->87 process4 file5 49 C:\Users\user\AppData\Roaming\YNfDrfV.exe, PE32 11->49 dropped 51 C:\Users\user\...\YNfDrfV.exe:Zone.Identifier, ASCII 11->51 dropped 53 C:\Users\user\AppData\Local\...\tmp299E.tmp, XML 11->53 dropped 55 C:\Users\user\AppData\...\ysWQ4BqQrF.exe.log, ASCII 11->55 dropped 99 Uses schtasks.exe or at.exe to add and modify task schedules 11->99 101 Writes to foreign memory regions 11->101 103 Allocates memory in foreign processes 11->103 105 Adds a directory exclusion to Windows Defender 11->105 17 RegSvcs.exe 11->17         started        20 powershell.exe 23 11->20         started        22 schtasks.exe 1 11->22         started        107 Antivirus detection for dropped file 15->107 109 Multi AV Scanner detection for dropped file 15->109 111 Injects a PE file into a foreign processes 15->111 24 RegSvcs.exe 15->24         started        26 schtasks.exe 1 15->26         started        signatures6 process7 signatures8 69 Modifies the context of a thread in another process (thread injection) 17->69 71 Maps a DLL or memory area into another process 17->71 73 Sample uses process hollowing technique 17->73 79 2 other signatures 17->79 28 explorer.exe 29 1 17->28 injected 75 Loading BitLocker PowerShell Module 20->75 32 WmiPrvSE.exe 20->32         started        34 conhost.exe 20->34         started        36 conhost.exe 22->36         started        77 Found direct / indirect Syscall (likely to bypass EDR) 24->77 38 conhost.exe 26->38         started        process9 dnsIp10 63 kpde.xyz 92.112.189.41, 49696, 80 UKRTELNETUA Ukraine 28->63 65 alliancecigars.net 15.197.225.128, 49694, 80 TANDEMUS United States 28->65 67 2 other IPs or domains 28->67 113 System process connects to network (likely due to code injection or exploit) 28->113 40 cmstp.exe 28->40         started        43 cscript.exe 28->43         started        signatures11 process12 signatures13 91 Modifies the context of a thread in another process (thread injection) 40->91 93 Maps a DLL or memory area into another process 40->93 95 Tries to detect virtualization through RDTSC time measurements 40->95 97 Switches to a custom stack to bypass stack traces 40->97 45 cmd.exe 1 40->45         started        process14 process15 47 conhost.exe 45->47         started       
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/ef4948765f8caae1f84b2199e785842e19e49c39630422c12a603c93d3e6b4b4
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/ef4948765f8caae1f84b2199e785842e19e49c39630422c12a603c93d3e6b4b4/
Threat name:
ByteCode-MSIL.Backdoor.FormBook
Create hunting rule
Status:
Malicious
First seen:
2025-03-01 17:13:36 UTC
File Type:
PE (.Net Exe)
Extracted files:
14
AV detection:
28 of 38 (73.68%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=55euq5s7rsvod6clegm6pbmefym6jhbzmmccfqjkma6jhu7gws2a._file
Verdict:
malicious
Label(s):
unc_loader_037
Create hunting rule
formbook
Create hunting rule
Similar samples:
795af0703ab2ab7cfcfcc38449e7da1a20967be437e5877ee27da317b3991357
Formbook
a1e04def7fd209402cfc002db03fb18c9d8694d6707b4201cbaec8ce3303ff53
Formbook
b6e1a7be0cd6d15ce7ba0bc79da9b8f280ab0060bc7754ba3df84555fc28b0db
Formbook
b96b39428f0eeea593f2b68faa42e478b315b4e80f937662f5520e98a1ba0f0c
Formbook
error
Formbook
f4f30e7141908e117623dcac4e9f98cee8287fab750a1d720bdba5350cad19c9
Formbook
+ 4'965 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:egs9 discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/250310-pcr1fatpx9/
Behaviour
Modifies registry class
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Checks computer location settings
Command and Scripting Interpreter: PowerShell
Formbook payload
Formbook
Formbook family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/ce1ed365-ca84-4a04-89b2-0317a62745d8
Unpacked files
SH256 hash:
ef4948765f8caae1f84b2199e785842e19e49c39630422c12a603c93d3e6b4b4
MD5 hash:
0be3c2adea2ab8c61cd2121e65e489ff
SHA1 hash:
161468a441925fe86e2a2d500d85f91d6eeb11e3
Link:
https://www.unpac.me/results/5145de8b-2472-48de-a419-12e6f4c85137/
SH256 hash:
33713d25c590e2caf0a6da811fcf7fe5d559a18f1b2eb6593ce79ff04f108f7b
MD5 hash:
62175257b38f97cb249f2a14f70813f1
SHA1 hash:
09159f5a402c8cf41fab3b29378fce7e8849150b
Link:
https://www.unpac.me/results/5145de8b-2472-48de-a419-12e6f4c85137/
SH256 hash:
128b79729cadbd204a33462523fb1ab7d7bcfd11a16b4d7fdc031f5882630251
MD5 hash:
15904b3b85f21e0304a687451d9fe682
SHA1 hash:
874e792521e27fca9cc34418da1fee1d109c4768
Detections:
SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24
Create hunting rule
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/5145de8b-2472-48de-a419-12e6f4c85137/
SH256 hash:
df63e7674512b9e60f662375faf0097b3e5846b509aaeb3b9f11e4cea897bb37
MD5 hash:
21bfc8f9db10167810af0b7270b1872e
SHA1 hash:
e9b9f6a1d1fa30bf02692b2ae2a948fa64b476b8
Detections:
win_formbook_w0
Create hunting rule
win_formbook_g0
Create hunting rule
win_formbook_auto
Create hunting rule
FormBook
Create hunting rule
Windows_Trojan_Formbook
Create hunting rule
Formbook
Create hunting rule
Link:
https://www.unpac.me/results/5145de8b-2472-48de-a419-12e6f4c85137/
Parent samples :
683e3979cc09db086095cbe840901b82951df941ed461f89a67b98bd0ffe5ff9
f5c1310cde2a72e5962fb57726082052a23777e395154a0c6274430268321cc2
19ea0308aed3ec79d5c2ff91ed48886e564d5aa37ce5d1bfec0e1ba959c42203
ef4948765f8caae1f84b2199e785842e19e49c39630422c12a603c93d3e6b4b4
Please note that we are no longer able to provide a coverage score for Virus Total.

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:DebuggerCheck__GlobalFlags
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerCheck__QueryInfo
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Active
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Thread
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:Formbook
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect Formbook in memory
Reference:internal research
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:meth_stackstrings
Create hunting rule
Author:Willi Ballenthin
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:NETexecutableMicrosoft
Create hunting rule
Author:malware-lu
Rule name:pe_imphash
Create hunting rule
Rule name:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SEH__vectored
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:SHA1_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:Sus_Obf_Enc_Spoof_Hide_PE
Create hunting rule
Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)
Rule name:Windows_Trojan_Formbook
Create hunting rule
Author:@malgamy12
Rule name:Windows_Trojan_Formbook_1112e116
Create hunting rule
Author:Elastic Security
Reference:https://www.elastic.co/security-labs/formbook-adopts-cab-less-approach
Rule name:win_formbook_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:Detects win.formbook.
Rule name:win_formbook_w0
Create hunting rule
Author:@malgamy12

File information

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

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
IDTitleSeverity
CHECK_AUTHENTICODEMissing Authenticodehigh
CHECK_DLL_CHARACTERISTICSMissing dll Security Characteristics (GUARD_CF)high

Comments