MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 2d15cd4ea7c6a5ff5f7f47acfedf52c6cb081a5791f8aa03a9a88636b58550ca. 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: 9


Intelligence 9 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 2d15cd4ea7c6a5ff5f7f47acfedf52c6cb081a5791f8aa03a9a88636b58550ca
SHA3-384 hash: fd627d68ca12d30634d3b33a89bc7dce7ad4733ff97e54ec5c8f413f66be80bd4099cac5935b5ed6e96cbe9c5157a271
SHA1 hash: e9ebe584ba53c0b9788060fb2834a8c3f2a5adaa
MD5 hash: 6c5f9bff682b56c29e686dc40389dd45
humanhash: magnesium-low-foxtrot-bulldog
File name:CRB21004.exe
Download: download sample
Signature FormBook
Create hunting rule
File size:399'872 bytes
First seen:2020-08-05 08:41:53 UTC
Last seen:Never
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:yNjfBrm+d63rue54NRe0fYJKy+gzGOB2Wf:ytfLdEyvj7AkWB
Threatray 5'124 similar samples on MalwareBazaar
TLSH 9B84F05CBBD1954DF6BA4E3F9D7100839E22F41FDA26D28B26721468413E25EBC74F22
Reporter abuse_ch
Tags:exe FormBook


Avatar
abuse_ch
Malspam distributing FormBook:

HELO: dongsonvina.co
Sending IP: 111.90.145.114
From: Cathy-Purchase <purchase@hysic.co>
Subject: AW: Urgent MOQ confirmation - CRB21004
Attachment: CRB21004.rar (contains "CRB21004.exe")

Intelligence

File Origin
# of uploads :
1
# of downloads :
71
Origin country :
n/a
Vendor Threat Intelligence
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/39248/
Result
Verdict:
Malware
Maliciousness:

Behaviour
Sending a UDP request
Creating a window
Creating a file in the %AppData% directory
Creating a file in the %temp% directory
Launching a process
Creating a process with a hidden window
Deleting a recently created file
Unauthorized injection to a recently created process
Creating a file
Launching cmd.exe command interpreter
Setting browser functions hooks
Enabling autorun by creating a file
Unauthorized injection to a system process
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/410640
Signature
Allocates memory in foreign processes
Benign windows process drops PE files
Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent)
Detected FormBook malware
Injects a PE file into a foreign processes
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)
Modifies the prolog of user mode functions (user mode inline hooks)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Scheduled temp file as task from temp location
System process connects to network (likely due to code injection or exploit)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file access)
Uses schtasks.exe or at.exe to add and modify task schedules
Writes to foreign memory regions
Yara detected AntiVM_3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 257590 Sample: CRB21004.exe Startdate: 05/08/2020 Architecture: WINDOWS Score: 100 67 Malicious sample detected (through community Yara rule) 2->67 69 Sigma detected: Scheduled temp file as task from temp location 2->69 71 Yara detected AntiVM_3 2->71 73 7 other signatures 2->73 10 CRB21004.exe 5 2->10         started        process3 file4 49 C:\Users\user\AppData\...\aQVLZUREKxSEhh.exe, PE32 10->49 dropped 51 C:\...\aQVLZUREKxSEhh.exe:Zone.Identifier, ASCII 10->51 dropped 53 C:\Users\user\AppData\Local\...\tmpE56A.tmp, XML 10->53 dropped 55 C:\Users\user\AppData\...\CRB21004.exe.log, ASCII 10->55 dropped 87 Tries to detect virtualization through RDTSC time measurements 10->87 89 Injects a PE file into a foreign processes 10->89 91 Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent) 10->91 14 CRB21004.exe 10->14         started        17 schtasks.exe 1 10->17         started        signatures5 process6 signatures7 107 Modifies the context of a thread in another process (thread injection) 14->107 109 Maps a DLL or memory area into another process 14->109 111 Sample uses process hollowing technique 14->111 113 Queues an APC in another process (thread injection) 14->113 19 explorer.exe 3 6 14->19 injected 24 conhost.exe 17->24         started        process8 dnsIp9 61 www.kumphornsolution.com 203.154.83.171, 49735, 80 INET-TH-ASInternetThailandCompanyLimitedTH Thailand 19->61 63 www.bebi.ltd 47.91.170.222, 80 CNNIC-ALIBABA-US-NET-APAlibabaUSTechnologyCoLtdC United States 19->63 65 www.akomik-hentaei.men 19->65 47 C:\Users\user\AppData\Local\...\ez7xhrj4m.exe, PE32 19->47 dropped 83 System process connects to network (likely due to code injection or exploit) 19->83 85 Benign windows process drops PE files 19->85 26 msdt.exe 1 17 19->26         started        30 ez7xhrj4m.exe 3 19->30         started        32 ez7xhrj4m.exe 2 19->32         started        34 3 other processes 19->34 file10 signatures11 process12 file13 57 C:\Users\user\AppData\...\8P0logrv.ini, data 26->57 dropped 59 C:\Users\user\AppData\...\8P0logri.ini, data 26->59 dropped 93 Detected FormBook malware 26->93 95 Tries to steal Mail credentials (via file access) 26->95 97 Tries to harvest and steal browser information (history, passwords, etc) 26->97 105 3 other signatures 26->105 36 cmd.exe 1 26->36         started        99 Injects a PE file into a foreign processes 30->99 39 ez7xhrj4m.exe 30->39         started        41 schtasks.exe 1 30->41         started        101 Writes to foreign memory regions 32->101 103 Allocates memory in foreign processes 32->103 signatures14 process15 signatures16 75 Tries to detect virtualization through RDTSC time measurements 36->75 43 conhost.exe 36->43         started        77 Modifies the context of a thread in another process (thread injection) 39->77 79 Maps a DLL or memory area into another process 39->79 81 Sample uses process hollowing technique 39->81 45 conhost.exe 41->45         started        process17
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/2d15cd4ea7c6a5ff5f7f47acfedf52c6cb081a5791f8aa03a9a88636b58550ca/
Threat name:
ByteCode-MSIL.Trojan.Kryptik
Create hunting rule
Status:
Malicious
First seen:
2020-08-05 03:18:25 UTC
AV detection:
24 of 28 (85.71%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=fuk42tvhy2s76x37i6wp5x2sy3fqqgsxsh4kua5jvcddnnmfkdfa._file
Verdict:
malicious
Similar samples:
49fd1fd4167dc08352e383bd51337af9206603336040aadacc85fe5a9226ce6e
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4e68480fbf23cd8b7efedd98614f1cd26032b955b4fc721e6622c62e4bb9f447
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6c7d10402361556d564ce74e16a05024a4e0ad31da03b98fb69d4f7c0079730f
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b26b6fd030ce29451797859444a1bd9e0a717b06a2909406e68edf183887632e
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ba988eeaeef4b7e706308c40094dd0fe2146918e0386565cc2a14243e3f0aa69
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d18ed67b05d0bbd6dfaba77a6053c92674bfef8abc8c7aae7c17f703adc6ea5c
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d19a1337bd1fd3534eabbbdf6db6e402de9c2996edf3b4bae1bb10e85d7b5bde
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d4943254bdebb92508362f26bd91da77d2aaecbcd73f086b917055c704a993a5
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f0a859474803c2ba7687f71bdc33ed9296ef1a18920d6c3fb425fc30ae266826
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f46ea866a034694bb34ddd4207ae960a5e43390ca9f9ad58daf4d14c42dbbc79
FormBook
+ 5'114 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
rat persistence spyware trojan stealer family:formbook
Link:
https://tria.ge/reports/200805-hydpe8zmae/
Behaviour
Suspicious use of WriteProcessMemory
Suspicious use of FindShellTrayWindow
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Modifies Internet Explorer settings
Suspicious behavior: MapViewOfSection
Suspicious use of SendNotifyMessage
Creates scheduled task(s)
Gathers network information
Drops file in Program Files directory
Suspicious use of SetThreadContext
Adds Run key to start application
Deletes itself
Reads user/profile data of web browsers
Formbook Payload
Formbook
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Kryptik
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/2d15cd4ea7c6a5ff5f7f47acfedf52c6cb081a5791f8aa03a9a88636b58550ca

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:win_nymaim_g0
Create hunting rule
Author:mak, msm, CERT.pl

File information

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

Malspam

FormBook

rar 77a5b683139a2b01576b3e8269e4f642d9f3490a563240aec44ade6b8fd1ac8d

FormBook

Executable exe 2d15cd4ea7c6a5ff5f7f47acfedf52c6cb081a5791f8aa03a9a88636b58550ca

(this sample)

  
Dropped by
MD5 f5005e52f5a8858280b0064e7739fae4
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/39248/
  
Dropped by
SHA256 77a5b683139a2b01576b3e8269e4f642d9f3490a563240aec44ade6b8fd1ac8d

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