MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 1a5d14c701d5d786f3940993cb3be259d29dae73e5af588d2acf439b40facd0e. 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: 19


Intelligence 19 IOCs YARA 18 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 1a5d14c701d5d786f3940993cb3be259d29dae73e5af588d2acf439b40facd0e
SHA3-384 hash: 1ed490e46cf3f164f5191d77badfa995b348f31db8a9e071901359afe02b4e0dfc489f9850ae7d8e4dced13010fb8a64
SHA1 hash: e9d29a508524989c66ac82fd5aadd4190c8fb2e1
MD5 hash: 9c027a6879082f610f44005ed5511fed
humanhash: bakerloo-queen-august-fillet
File name:rntrCvz08CPYvtX.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:694'272 bytes
First seen:2025-03-17 15:12:57 UTC
Last seen:2025-03-24 14:50:09 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'204 x SnakeKeylogger)
ssdeep 12288:7QpFP5m0CBOK5j8dkF7zFoN3WVW6136pp14KT+:IFP4FBOaC3WVW6136pp14J
Threatray 4'865 similar samples on MalwareBazaar
TLSH T170E4F19526B8CF17E97957F50930D23443F62D9A9822E34A8EC1FCDF34A1B816B25393
TrID 69.7% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.0% (.EXE) Win64 Executable (generic) (10522/11/4)
6.2% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.2% (.EXE) Win32 Executable (generic) (4504/4/1)
1.9% (.EXE) Win16/32 Executable Delphi generic (2072/23)
Magika pebin
Reporter BastianHein
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
3
# of downloads :
505
Origin country :
CL CL
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
rntrCvz08CPYvtX.exe
Verdict:
Malicious activity
Analysis date:
2025-03-17 15:13:42 UTC
Tags:
autorun-sched formbook stealer xloader
Link:
https://app.any.run/tasks/4edd5562-41d7-4168-80d6-afde9bd68010

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
Score:
95.7%
Link:
https://cyber-fortress.com/docs/result/index.php?id=67d852803962f1a6f4725ee6
Tags:
micro shell spawn
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Сreating synchronization primitives
Creating a process with a hidden window
Creating a file in the %AppData% directory
Enabling the 'hidden' option for recently created files
Adding an access-denied ACE
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
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/1a5d14c701d5d786f3940993cb3be259d29dae73e5af588d2acf439b40facd0e
Result
Verdict:
SUSPICIOUS
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/5dc7db75-17e4-4d06-9ac6-b3105acb7978
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1640721
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
Allocates memory in foreign processes
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)
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: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Scheduled temp file as task from temp location
Switches to a custom stack to bypass stack traces
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: 1640721 Sample: rntrCvz08CPYvtX.exe Startdate: 17/03/2025 Architecture: WINDOWS Score: 100 59 www.odesfactory.xyz 2->59 61 www.hiefworthextendfirmbridge.xyz 2->61 63 10 other IPs or domains 2->63 77 Found malware configuration 2->77 79 Malicious sample detected (through community Yara rule) 2->79 81 Antivirus detection for URL or domain 2->81 85 8 other signatures 2->85 11 rntrCvz08CPYvtX.exe 7 2->11         started        15 JxquXfKYV.exe 5 2->15         started        signatures3 83 Performs DNS queries to domains with low reputation 61->83 process4 file5 51 C:\Users\user\AppData\Roaming\JxquXfKYV.exe, PE32 11->51 dropped 53 C:\Users\...\JxquXfKYV.exe:Zone.Identifier, ASCII 11->53 dropped 55 C:\Users\user\AppData\Local\...\tmpD514.tmp, XML 11->55 dropped 57 C:\Users\user\...\rntrCvz08CPYvtX.exe.log, ASCII 11->57 dropped 95 Uses schtasks.exe or at.exe to add and modify task schedules 11->95 97 Writes to foreign memory regions 11->97 99 Allocates memory in foreign processes 11->99 101 Adds a directory exclusion to Windows Defender 11->101 17 RegSvcs.exe 11->17         started        20 powershell.exe 23 11->20         started        22 powershell.exe 23 11->22         started        28 2 other processes 11->28 103 Multi AV Scanner detection for dropped file 15->103 105 Injects a PE file into a foreign processes 15->105 24 RegSvcs.exe 15->24         started        26 schtasks.exe 15->26         started        signatures6 process7 signatures8 65 Modifies the context of a thread in another process (thread injection) 17->65 67 Maps a DLL or memory area into another process 17->67 69 Sample uses process hollowing technique 17->69 75 2 other signatures 17->75 30 explorer.exe 53 1 17->30 injected 71 Loading BitLocker PowerShell Module 20->71 32 conhost.exe 20->32         started        34 WmiPrvSE.exe 20->34         started        36 conhost.exe 22->36         started        73 Found direct / indirect Syscall (likely to bypass EDR) 24->73 38 conhost.exe 26->38         started        40 conhost.exe 28->40         started        process9 process10 42 control.exe 30->42         started        45 wlanext.exe 30->45         started        signatures11 87 Modifies the context of a thread in another process (thread injection) 42->87 89 Maps a DLL or memory area into another process 42->89 91 Tries to detect virtualization through RDTSC time measurements 42->91 93 Switches to a custom stack to bypass stack traces 42->93 47 cmd.exe 42->47         started        process12 process13 49 conhost.exe 47->49         started       
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/1a5d14c701d5d786f3940993cb3be259d29dae73e5af588d2acf439b40facd0e
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/1a5d14c701d5d786f3940993cb3be259d29dae73e5af588d2acf439b40facd0e/
Threat name:
Win32.Backdoor.FormBook
Create hunting rule
Status:
Malicious
First seen:
2025-03-17 09:43:02 UTC
File Type:
PE (.Net Exe)
Extracted files:
21
AV detection:
18 of 22 (81.82%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=djorjryb2xlyn44ubgj4wo7clhjj3ltt4wxvrdjkz5bzwqh2zuha._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
unc_loader_037
Create hunting rule
Similar samples:
3f616f7935f4c97239699196e64056b45be53e73d02a0b70e482c886e3a13965
Formbook
b603a586ea389d7ce6ea8b3ae24eb08bbe6c020e341ee32845c6edf868aa9bbd
Formbook
d0387872c43a63fc0a157c84edc3a99abde2af204ba4f25969209ce38d7ed15f
Formbook
d8c0f4739b6a46ee8c46a6af4622158b9a866b6eabd1dd6a88228856520b714d
Formbook
error
Formbook
f2d754008958e2c90dbac5f60958e0add5403563e51f5414599d35f88cd0db2b
Formbook
f38a008406f2bca311aa8014976f27669d52d494286f3dbc1dd10259f8382324
Formbook
f5bf548a92e16ade13e22e9def6ba5bc424c9ff797570e5992b615d9adce311c
Formbook
f9f4df8b0dec45180e507d5fb6fdfd852823cbbad16cd662950d0b748a6baff0
Formbook
+ 4'855 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:my18 discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/250317-slr9casyft/
Behaviour
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
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/389cc9a4-a3c0-42d5-9a2f-e8c247527123
Unpacked files
SH256 hash:
1a5d14c701d5d786f3940993cb3be259d29dae73e5af588d2acf439b40facd0e
MD5 hash:
9c027a6879082f610f44005ed5511fed
SHA1 hash:
e9d29a508524989c66ac82fd5aadd4190c8fb2e1
Link:
https://www.unpac.me/results/c1dfd05f-cddb-4575-8f38-d743cb074d15/
SH256 hash:
c650332b4646eac501eea23c3dee5f24b6b4e9556e8b68d776e333012f835a1e
MD5 hash:
6ee56c31222274fdeb618b65b608ac43
SHA1 hash:
bab4dca58ed9906789ead3a95f7b461f1ce33cd7
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/c1dfd05f-cddb-4575-8f38-d743cb074d15/
SH256 hash:
51ea9157b7cae4cdee16d6007e949dfdf833de7715f4b0bfbdd91b9cd1b5a82a
MD5 hash:
87b522966f156f38d9ff9fb09fe89ce2
SHA1 hash:
e0cf3a26b03e8affa99961cf95e9d5342cc5f98c
Detections:
INDICATOR_EXE_Packed_SmartAssembly
Create hunting rule
Link:
https://www.unpac.me/results/c1dfd05f-cddb-4575-8f38-d743cb074d15/
Parent samples :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 hash:
12758ec96b1f25fb5e300c9ae98569c3c5b569baa723139ccacc475ab371301c
MD5 hash:
ef9ef67d5a832bfb7cff9fb441ff9a1b
SHA1 hash:
9013556c4afddcc2dfd23997350c0d74aae285fa
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/c1dfd05f-cddb-4575-8f38-d743cb074d15/
Parent samples :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 family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/1a5d14c701d5/report/overview.html
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/1a5d14c701d5d786f3940993cb3be259d29dae73e5af588d2acf439b40facd0e

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:AgentTesla_DIFF_Common_Strings_01
Create hunting rule
Author:schmidtsz
Description:Identify partial Agent Tesla strings
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
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: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:NET
Create hunting rule
Author:malware-lu
Rule name:NETexecutableMicrosoft
Create hunting rule
Author:malware-lu
Rule name:pe_detect_tls_callbacks
Create hunting rule
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)

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 (HIGH_ENTROPY_VA)high

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