MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b43776e06bb69bbd5171248b0fc82bf9a6cf2641b94717d4ebd77b38333726dc. 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: 14


Intelligence 14 IOCs YARA 6 File information Comments
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SHA256 hash: b43776e06bb69bbd5171248b0fc82bf9a6cf2641b94717d4ebd77b38333726dc
SHA3-384 hash: 00ef151f7f544396da5cad6b946ea0d3cc5db0e727103de8f64b2afd605444960dda2324c96cd680988906caf36a8984
SHA1 hash: 2a6a35af2763d5b342b5871fd28ada67a2426d74
MD5 hash: 1ffff4b37aae6448b76a4449c6a09c84
humanhash: video-nevada-diet-maine
File name:Isfzr.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:129'024 bytes
First seen:2022-06-15 07:18:12 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'661 x AgentTesla, 19'474 x Formbook, 12'208 x SnakeKeylogger)
ssdeep 768:JuIkczpB41/1e6OuqD0XM/O6E4z6ER2RAWjc4iZJNntCTha+dmNJ:MIjBk1e6Ouq//VE4LA1jcdZfY93m/
TLSH T182C3B48DB9C448C6DF2132B3F2E3E96615457C9F562D8B1AE3A3770ADEF24810623917
TrID 72.5% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.4% (.EXE) Win64 Executable (generic) (10523/12/4)
6.5% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.4% (.EXE) Win32 Executable (generic) (4505/5/1)
2.0% (.EXE) OS/2 Executable (generic) (2029/13)
File icon (PE):PE icon
dhash icon 8ab29ab2b2d29aaa (6 x Formbook, 3 x SnakeKeylogger)
Reporter GovCERT_CH
Tags:exe FormBook xloader

Intelligence

File Origin
# of uploads :
1
# of downloads :
287
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
Isfzr.exe
Verdict:
Malicious activity
Analysis date:
2022-06-15 07:31:45 UTC
Tags:
formbook trojan stealer
Link:
https://app.any.run/tasks/3cb997a5-bda5-44b1-8789-6b88432846a2

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Formbook
Create hunting rule
Link:
https://www.capesandbox.com/analysis/280066/
Detection(s):
SecuriteInfo.com.Trojan.Downloader.10124.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Launching a process
Sending a custom TCP request
Сreating synchronization primitives
DNS request
Running batch commands
Creating a process with a hidden window
Creating a file in the %AppData% subdirectories
Creating a file
Searching for synchronization primitives
Launching cmd.exe command interpreter
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Unauthorized injection to a system process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
packed
Link:
https://www.filescan.io/uploads/62a987c896efd87b05fa56e2/reports/1017d16b-f088-4f26-bf05-1579171d04cf/overview
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.
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/0d20e891-5762-4df7-a77b-39b5f0ff05d0
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1013501
Signature
.NET source code contains potential unpacker
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Machine Learning detection for dropped file
Machine Learning detection for sample
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
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Tries to detect virtualization through RDTSC time measurements
Yara detected Costura Assembly Loader
Yara detected FormBook
Yara detected MSILDownloaderGeneric
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 645993 Sample: Isfzr.exe Startdate: 15/06/2022 Architecture: WINDOWS Score: 100 82 Malicious sample detected (through community Yara rule) 2->82 84 Antivirus detection for URL or domain 2->84 86 Multi AV Scanner detection for submitted file 2->86 88 6 other signatures 2->88 10 Isfzr.exe 16 7 2->10         started        process3 dnsIp4 80 cdn.discordapp.com 162.159.129.233, 443, 49836 CLOUDFLARENETUS United States 10->80 64 C:\Users\user\AppData\Roaming\...\Xkdikbu.exe, PE32 10->64 dropped 66 C:\Users\user\...\Xkdikbu.exe:Zone.Identifier, ASCII 10->66 dropped 68 C:\Users\user\AppData\Local\...\Isfzr.exe.log, ASCII 10->68 dropped 14 InstallUtil.exe 10->14         started        17 cmd.exe 1 10->17         started        19 powershell.exe 14 10->19         started        file5 process6 signatures7 100 Modifies the context of a thread in another process (thread injection) 14->100 102 Maps a DLL or memory area into another process 14->102 104 Sample uses process hollowing technique 14->104 106 2 other signatures 14->106 21 explorer.exe 14->21 injected 23 conhost.exe 17->23         started        25 timeout.exe 1 17->25         started        27 conhost.exe 19->27         started        process8 process9 29 explorer.exe 21->29         started        32 Xkdikbu.exe 14 3 21->32         started        35 Xkdikbu.exe 21->35         started        dnsIp10 90 Modifies the context of a thread in another process (thread injection) 29->90 92 Maps a DLL or memory area into another process 29->92 94 Tries to detect virtualization through RDTSC time measurements 29->94 37 cmd.exe 29->37         started        39 explorer.exe 29->39         started        70 162.159.135.233, 443, 49937 CLOUDFLARENETUS United States 32->70 72 cdn.discordapp.com 32->72 96 Multi AV Scanner detection for dropped file 32->96 98 Machine Learning detection for dropped file 32->98 42 cmd.exe 32->42         started        44 powershell.exe 14 32->44         started        46 InstallUtil.exe 32->46         started        74 162.159.133.233, 443, 49938 CLOUDFLARENETUS United States 35->74 76 cdn.discordapp.com 35->76 48 powershell.exe 35->48         started        50 cmd.exe 35->50         started        signatures11 process12 dnsIp13 52 conhost.exe 37->52         started        78 192.168.2.1 unknown unknown 39->78 54 conhost.exe 42->54         started        56 timeout.exe 42->56         started        58 conhost.exe 44->58         started        60 conhost.exe 48->60         started        62 conhost.exe 50->62         started        process14
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b43776e06bb69bbd5171248b0fc82bf9a6cf2641b94717d4ebd77b38333726dc/
Threat name:
Win32.Trojan.Leonem
Create hunting rule
Status:
Malicious
First seen:
2022-06-15 02:58:25 UTC
File Type:
PE (.Net Exe)
Extracted files:
13
AV detection:
19 of 26 (73.08%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=wq3xnydlw2n32ulresfq7sbl7gtm6jsbxfdrpvhl255tqmzxe3oa._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Result
Malware family:
xloader
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Score:
  10/10
Tags:
family:xloader campaign:kunf loader persistence rat suricata
Link:
https://tria.ge/reports/220615-h5hh5sbegm/
Behaviour
Delays execution with timeout.exe
Modifies Internet Explorer settings
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
Drops file in Program Files directory
Suspicious use of SetThreadContext
Adds Run key to start application
Xloader Payload
Xloader
suricata: ET MALWARE FormBook CnC Checkin (GET)
Unpacked files
SH256 hash:
b43776e06bb69bbd5171248b0fc82bf9a6cf2641b94717d4ebd77b38333726dc
MD5 hash:
1ffff4b37aae6448b76a4449c6a09c84
SHA1 hash:
2a6a35af2763d5b342b5871fd28ada67a2426d74
Link:
https://www.unpac.me/results/17d4acb0-7067-4841-95ff-417b1bdb2547/
Malware family:
XLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b43776e06bb6/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/b43776e06bb69bbd5171248b0fc82bf9a6cf2641b94717d4ebd77b38333726dc

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:INDICATOR_SUSPICIOUS_EXE_DiscordURL
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Author:ditekSHen
Description:Detects executables Discord URL observed in first stage droppers
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:SUSP_Discord_Attachments_URL
Create hunting rule
Author:SECUINFRA Falcon Team
Description:Detects a PE file that contains an Discord Attachments URL. This is often used by Malware to download further payloads
Rule name:SUSP_PE_Discord_Attachment_Oct21_1
Create hunting rule
Author:Florian Roth
Description:Detects suspicious executable with reference to a Discord attachment (often used for malware hosting on a legitimate FQDN)
Reference:Internal Research
Rule name:WhisperGateStage2
Create hunting rule
Author:Harish Kumar
Description:Yara Rule to Detect WhisperGateStage2

File information

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

Malspam

Formbook

Executable exe b43776e06bb69bbd5171248b0fc82bf9a6cf2641b94717d4ebd77b38333726dc

(this sample)

  
Dropped by
xloader
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/280066/

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