MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a21c6c623959c4995842ace85f7f5a7e3751c4930d28ebad92c7a737a7f8cfb8. 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: 17


Intelligence 17 IOCs YARA 8 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: a21c6c623959c4995842ace85f7f5a7e3751c4930d28ebad92c7a737a7f8cfb8
SHA3-384 hash: 107dab571f9468f7c0c63ca834382ccd5095136fdd15e0da942dd14b8fc41a0efaa6399949847ca4a00396626057719a
SHA1 hash: 308eae042a3fdb61af8e22f5e23cd0da5dab5cf9
MD5 hash: 3d734fb96e17397d796961993832b394
humanhash: mississippi-harry-gee-victor
File name:ATTACHED INVOICE.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:284'418 bytes
First seen:2023-02-12 03:20:27 UTC
Last seen:2023-02-13 14:30:09 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 61259b55b8912888e90f516ca08dc514 (1'059 x Formbook, 741 x AgentTesla, 427 x GuLoader)
ssdeep 6144:vYa6WrYVSkEyqOIc5/Mws5T3Ckge18PtOgOa80:vYg07EyqOj9MH5T2e1g0gBF
Threatray 18'671 similar samples on MalwareBazaar
TLSH T1865422091765EC97CDF203F2747AEAD24A6AE91524B9AB2F13107B487D74201DD2F3B2
TrID 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
15.9% (.EXE) Win64 Executable (generic) (10523/12/4)
9.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
7.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
6.8% (.EXE) Win32 Executable (generic) (4505/5/1)
File icon (PE):PE icon
dhash icon b2a89c96a2cada72 (2'283 x Formbook, 981 x Loki, 803 x AgentTesla)
Reporter Anonymous
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
5
# of downloads :
194
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
ATTACHED INVOICE.exe
Verdict:
Malicious activity
Analysis date:
2023-02-12 03:22:33 UTC
Tags:
trojan formbook stealer
Link:
https://app.any.run/tasks/dafd82b3-9982-4168-9dd8-b2671c651523

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/364253/
Detection(s):
Sanesecurity.Rogue.0hr.20230211-0434.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Creating a window
Creating a process from a recently created file
Сreating synchronization primitives
Searching for the window
Searching for synchronization primitives
Launching a process
DNS request
Sending an HTTP GET request
Reading critical registry keys
Launching the default Windows debugger (dwwin.exe)
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Stealing user critical data
Query of malicious DNS domain
Unauthorized injection to a system process
Sending an HTTP GET request to an infection source
Result
Malware family:
n/a
Score:
  5/10
Tags:
n/a
Link:
https://dragonfly.certego.net/analysis/68381/overview
Behaviour
MalwareBazaar
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
overlay packed shell32.dll
Link:
https://www.filescan.io/uploads/63e85b1fa00eef19ff60217a/reports/1bff954f-c9b1-46b7-bf82-d96a1725e4e1/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/a21c6c623959c4995842ace85f7f5a7e3751c4930d28ebad92c7a737a7f8cfb8
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/ea8f4e8d-ab96-4213-87b5-cf1ae89f51c1
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1172382
Signature
Antivirus detection for URL or domain
Detected unpacking (changes PE section rights)
Executable has a suspicious name (potential lure to open the executable)
Initial sample is a PE file and has a suspicious name
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 domain / URL
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
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Uses ipconfig to lookup or modify the Windows network settings
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 805172 Sample: ATTACHED INVOICE.exe Startdate: 12/02/2023 Architecture: WINDOWS Score: 100 35 Snort IDS alert for network traffic 2->35 37 Multi AV Scanner detection for domain / URL 2->37 39 Malicious sample detected (through community Yara rule) 2->39 41 6 other signatures 2->41 9 ATTACHED INVOICE.exe 19 2->9         started        process3 file4 27 C:\Users\user\AppData\...\aszqjzrhet.exe, PE32 9->27 dropped 12 aszqjzrhet.exe 1 9->12         started        process5 signatures6 55 Multi AV Scanner detection for dropped file 12->55 57 Detected unpacking (changes PE section rights) 12->57 59 Maps a DLL or memory area into another process 12->59 15 aszqjzrhet.exe 12->15         started        18 conhost.exe 12->18         started        process7 signatures8 61 Modifies the context of a thread in another process (thread injection) 15->61 63 Maps a DLL or memory area into another process 15->63 65 Sample uses process hollowing technique 15->65 67 Queues an APC in another process (thread injection) 15->67 20 explorer.exe 2 6 15->20 injected process9 dnsIp10 29 www.wanknumbers.co.uk 81.17.18.196, 49708, 49709, 49710 PLI-ASCH Switzerland 20->29 31 www.againstthealgorith.com 81.17.29.147, 49717, 49718, 49719 PLI-ASCH Switzerland 20->31 33 12 other IPs or domains 20->33 43 System process connects to network (likely due to code injection or exploit) 20->43 45 Uses ipconfig to lookup or modify the Windows network settings 20->45 24 ipconfig.exe 13 20->24         started        signatures11 process12 signatures13 47 Tries to steal Mail credentials (via file / registry access) 24->47 49 Tries to harvest and steal browser information (history, passwords, etc) 24->49 51 Modifies the context of a thread in another process (thread injection) 24->51 53 Maps a DLL or memory area into another process 24->53
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a21c6c623959c4995842ace85f7f5a7e3751c4930d28ebad92c7a737a7f8cfb8/
Threat name:
Win32.Trojan.Leonem
Create hunting rule
Status:
Malicious
First seen:
2023-02-11 11:34:17 UTC
File Type:
PE (Exe)
Extracted files:
3
AV detection:
27 of 39 (69.23%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=uiogyyrzlhcjswccvtuf6722py3vdretbuuoxlmsy6ttpj7yz64a._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Similar samples:
04b2ea00c6a5376c064e2cc546e8df707c2cf45135d2b544a49fbd56bbc891a1
Formbook
27092cac933ddf8f3790ad2cfdd8bb8ffa80adec09f96f4acb2b3ee24ee2157e
Formbook
4da18f5e360f53c89bbffc55376aba4d8e2b088d74eaa60546f574a6c976fb36
Formbook
9409e367a0c9bdead66274f114e20c752c57723ce730c715b5f126f37ec1964e
Formbook
9ac3510864002a124f1c7b61f64da4e87c5b944b21afb4677faa639b61a11929
Formbook
bee95f90676280bca3212cc77b2dbd497f590cd560ce3005f2998fa324698427
Formbook
c03d796c8b75c36e92aa53d1fb21d89fb0fc6aa57df540ca0074c43661a6cec0
Formbook
+ 18'661 additional samples on MalwareBazaar
Result
Malware family:
n/a
Score:
  8/10
Tags:
spyware stealer
Link:
https://tria.ge/reports/230212-dwbl1scg2y/
Behaviour
Modifies Internet Explorer settings
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
Suspicious use of SetThreadContext
Checks computer location settings
Executes dropped EXE
Loads dropped DLL
Reads user/profile data of web browsers
Blocklisted process makes network request
Unpacked files
SH256 hash:
91aa8748aa045a47b6a17030fc04d27beb613fb2ee14b4d4c4d4c7bc69efb2c2
MD5 hash:
70389eb0106cbe2ce25819f035d258e2
SHA1 hash:
50f9b21fb12e44c77dfdfd36b2a260ad5dc643a1
Detections:
win_formbook_w0
Create hunting rule
win_formbook_auto
Create hunting rule
win_formbook_g0
Create hunting rule
Link:
https://www.unpac.me/results/49f27b7b-56b8-41e6-94d0-afead0453e42/
Parent samples :
8289f0ae5fa644fbcff4e73ca5867f8e277e4fbb14af00fb7a5c99971b175ef6
27092cac933ddf8f3790ad2cfdd8bb8ffa80adec09f96f4acb2b3ee24ee2157e
6f04629d1be4e681826c8fd0601781e271c4aec4ace5cc1f1cb91989231b14ff
19252df2160c35f1b7ce3f34af0b56a42886eac6fc64a939d2a787bb957af583
0a926406e3d30f2fcdb73082840e01eca5e24c4eac116d9983c1ad77d1bd47a2
bee95f90676280bca3212cc77b2dbd497f590cd560ce3005f2998fa324698427
44039b65db01a50864e76cf1a6e3134f4d57650a55958ae03b23380077fc25c6
9409e367a0c9bdead66274f114e20c752c57723ce730c715b5f126f37ec1964e
10cdd9119cf9d3bdd4eda712d160a49c77f469989053ec08291f63078cea5a99
2a61e0add99b698af28cc73128adfcea58d0ff6bc7e83f60f20dbe17d4062eda
ab29ef95908c5f4ad5acd6dd35f3fa8e5bf788c4cfef602324737b5cee0c00ab
4da18f5e360f53c89bbffc55376aba4d8e2b088d74eaa60546f574a6c976fb36
c03d796c8b75c36e92aa53d1fb21d89fb0fc6aa57df540ca0074c43661a6cec0
6769905302dd965b16c74da2c0a5633dd4cbfe5c8879a5db6a7322d53d668533
a21c6c623959c4995842ace85f7f5a7e3751c4930d28ebad92c7a737a7f8cfb8
SH256 hash:
bee5ec36671e00c89c23f14cdffd1ac19fbda2bc1997610533fe136e8f2e1ab6
MD5 hash:
feb9ff6c435ce268ffa0feb5546deab1
SHA1 hash:
194d637195bc7a4c812b6e2bcad10f3a4b40c967
Link:
https://www.unpac.me/results/49f27b7b-56b8-41e6-94d0-afead0453e42/
SH256 hash:
b57c581985294e0b94f74d7b201a3f8a0e2f0614bee890f1bd2b0912d8832d19
MD5 hash:
de0ba72685392e9ab69f32567ffcfbb4
SHA1 hash:
ae881db1d6eab6976668f4fe1022b3f3aec124b1
Link:
https://www.unpac.me/results/49f27b7b-56b8-41e6-94d0-afead0453e42/
SH256 hash:
a21c6c623959c4995842ace85f7f5a7e3751c4930d28ebad92c7a737a7f8cfb8
MD5 hash:
3d734fb96e17397d796961993832b394
SHA1 hash:
308eae042a3fdb61af8e22f5e23cd0da5dab5cf9
Link:
https://www.unpac.me/results/49f27b7b-56b8-41e6-94d0-afead0453e42/
Malware family:
XLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/a21c6c623959/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/a21c6c623959c4995842ace85f7f5a7e3751c4930d28ebad92c7a737a7f8cfb8

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:meth_get_eip
Create hunting rule
Author:Willi Ballenthin
Rule name:meth_stackstrings
Create hunting rule
Author:Willi Ballenthin
Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns
Rule name:Windows_Trojan_Formbook
Create hunting rule
Author:@malgamy12
Rule name:Windows_Trojan_Formbook_1112e116
Create hunting rule
Author:Elastic Security
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.

Malspam

Formbook

zip da20ddb8f9c542e7c11d119c6fb745f2619caa7b5cd29efa1d0a42de994d873c

Formbook

Executable exe a21c6c623959c4995842ace85f7f5a7e3751c4930d28ebad92c7a737a7f8cfb8

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/364253/
  
Dropped by
SHA256 da20ddb8f9c542e7c11d119c6fb745f2619caa7b5cd29efa1d0a42de994d873c
  
Dropped by
MD5 73009e08ab4d8b11bb8bdf6948e038f4
  
Dropped by
SHA256 b4200046cce33757a5d9624c35cefcd43a2d64adfbc80607f7c26b59bff3034b
  
Dropped by
MD5 971b8218ba2493718e7608f5f23a234a

Comments