MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b73a2b13c7e0a63948b9b6861214ef3ba647d3ac83152df4e3e9bbe9eeea1e5f. 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: 11


Maldoc score: 9


Intelligence 11 IOCs YARA 5 File information Comments
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SHA256 hash: b73a2b13c7e0a63948b9b6861214ef3ba647d3ac83152df4e3e9bbe9eeea1e5f
SHA3-384 hash: be4f7555f80fc315485052e2b344ddd95f3e4662f45dd930851d05904b23f6f36e65dbac62282df1f32b1a9116b9ab48
SHA1 hash: 9c1158a9e0af62c974e00a8f51981554848a19b6
MD5 hash: bdc0c7d382181b01e490f6d265c4ff18
humanhash: august-beer-speaker-butter
File name:bdc0c7d3_by_Libranalysis
Download: download sample
Signature Formbook
Create hunting rule
File size:38'400 bytes
First seen:2021-04-28 11:00:47 UTC
Last seen:Never
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 768:Mck3hOdsylKlgryzc4bNhZFGzE+cL2knAJ0OiCgBVvz7yCMLo7XoUpVQI:rk3hOdsylKlgryzc4bNhZFGzE+cL2knJ
TLSH AA0371E2B286DC15DA5803364EEBC6D72776BC515F66838B3289F71F1FB1AC08902617
Reporter Libranalysis
Tags:FormBook


Avatar
Libranalysis
Uploaded as part of the sample sharing project

Office OLE Information

This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id
Maldoc score: 9
Application name is Microsoft Excel
Office document is in OLE format
Office document contains VBA Macros
OLE dump

MalwareBazaar was able to identify 15 sections in this file using oledump:

Section IDSection sizeSection name
1107 bytesCompObj
2244 bytesDocumentSummaryInformation
3200 bytesSummaryInformation
415373 bytesWorkbook
5493 bytes_VBA_PROJECT_CUR/PROJECT
6137 bytes_VBA_PROJECT_CUR/PROJECTwm
76474 bytes_VBA_PROJECT_CUR/VBA/Pjxsvr_dHFNCW_71ND1Lrsvv
8991 bytes_VBA_PROJECT_CUR/VBA/Sheet1
91255 bytes_VBA_PROJECT_CUR/VBA/ThisWorkbook
104525 bytes_VBA_PROJECT_CUR/VBA/_VBA_PROJECT
111779 bytes_VBA_PROJECT_CUR/VBA/__SRP_0
12256 bytes_VBA_PROJECT_CUR/VBA/__SRP_1
13267 bytes_VBA_PROJECT_CUR/VBA/__SRP_2
14284 bytes_VBA_PROJECT_CUR/VBA/__SRP_3
15618 bytes_VBA_PROJECT_CUR/VBA/dir
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecworkbook_openRuns when the Excel Workbook is opened
SuspiciousRunMay run an executable file or a system command
SuspiciousCreateObjectMay create an OLE object
SuspiciousChrMay attempt to obfuscate specific strings (use option --deobf to deobfuscate)
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
1
# of downloads :
81
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
bdc0c7d3_by_Libranalysis
Verdict:
Malicious activity
Analysis date:
2021-04-28 11:18:53 UTC
Tags:
macros macros-on-open maldoc-17 exe-to-msi trojan formbook stealer
Link:
https://app.any.run/tasks/762d54d8-f8f0-4928-b116-9f407c1c3c8b

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Legit
File type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Has a screenshot:
False
Contains macros:
True
Detection:
Formbook
Create hunting rule
Link:
https://www.capesandbox.com/analysis/144929/
Detection(s):
TwinWave.EvilDoc.WSHCROVARCHRMATHLONGGONE.20200524.UNOFFICIAL
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TwinWave.EvilDoc.CROAndTheTangerineDream.M1.20200630.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a process with a hidden window
Launching a process
DNS request
Sending an HTTP GET request
Creating a process from a recently created file
Creating a file in the %temp% directory
Creating a file
Launching cmd.exe command interpreter
Deleting a recently created file
Setting browser functions hooks
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Running batch commands by exploiting the app vulnerability
Unauthorized injection to a system process
Unauthorized injection to a browser process
Result
Verdict:
Malicious
File Type:
Legacy Excel File with Macro
Link:
https://app.docguard.net/b73a2b13c7e0a63948b9b6861214ef3ba647d3ac83152df4e3e9bbe9eeea1e5f/results/dashboard
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/b73a2b13c7e0a63948b9b6861214ef3ba647d3ac83152df4e3e9bbe9eeea1e5f
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/700423
Signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Detected unpacking (changes PE section rights)
DLL side loading technique detected
Document contains an embedded VBA macro which may execute processes
Document contains an embedded VBA with many randomly named variables
Document contains an embedded VBA with many string operations indicating source code obfuscation
Document exploit detected (process start blacklist hit)
Found malware configuration
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)
Obfuscated command line found
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 399127 Sample: bdc0c7d3_by_Libranalysis Startdate: 28/04/2021 Architecture: WINDOWS Score: 100 34 arcencieldeco.com.tn 2->34 50 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->50 52 Found malware configuration 2->52 54 Malicious sample detected (through community Yara rule) 2->54 56 10 other signatures 2->56 10 MSID815.tmp 19 2->10         started        14 EXCEL.EXE 10 8 2->14         started        signatures3 process4 file5 32 C:\Users\user\AppData\...\su9fuys59e.dll, PE32 10->32 dropped 60 Detected unpacking (changes PE section rights) 10->60 62 Maps a DLL or memory area into another process 10->62 64 DLL side loading technique detected 10->64 66 Tries to detect virtualization through RDTSC time measurements 10->66 16 MSID815.tmp 10->16         started        68 Obfuscated command line found 14->68 19 cmd.exe 14->19         started        signatures6 process7 signatures8 42 Modifies the context of a thread in another process (thread injection) 16->42 44 Maps a DLL or memory area into another process 16->44 46 Sample uses process hollowing technique 16->46 48 Queues an APC in another process (thread injection) 16->48 21 explorer.exe 16->21 injected 25 msiexec.exe 19->25         started        process9 dnsIp10 36 mekarauroko7389.com 163.44.239.72, 49167, 80 INTERQGMOInternetIncJP Japan 21->36 38 jjsmiths.com 45.130.228.83, 49166, 80 AS-HOSTINGERLT Germany 21->38 40 8 other IPs or domains 21->40 58 System process connects to network (likely due to code injection or exploit) 21->58 27 colorcpl.exe 21->27         started        signatures11 process12 signatures13 70 Modifies the context of a thread in another process (thread injection) 27->70 72 Maps a DLL or memory area into another process 27->72 74 Tries to detect virtualization through RDTSC time measurements 27->74 30 cmd.exe 27->30         started        process14
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b73a2b13c7e0a63948b9b6861214ef3ba647d3ac83152df4e3e9bbe9eeea1e5f/
Threat name:
Document-Word.Trojan.Hancitor
Create hunting rule
Status:
Malicious
First seen:
2021-04-28 11:01:12 UTC
AV detection:
14 of 29 (48.28%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=w45cwe6h4ctdssfzw2dbefhphotepu5mqmks35hd5g56t3xkdzpq._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook macro rat spyware stealer trojan xlm
Link:
https://tria.ge/reports/210428-q25jec48yn/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies data under HKEY_USERS
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of SetWindowsHookEx
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
NSIS installer
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Drops file in Windows directory
Suspicious use of SetThreadContext
Enumerates connected drives
Loads dropped DLL
Use of msiexec (install) with remote resource
Blocklisted process makes network request
Executes dropped EXE
Formbook Payload
Formbook
Process spawned unexpected child process
Malware Config
C2 Extraction:
http://www.111bjs.com/ccr/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Formbook
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/b73a2b13c7e0a63948b9b6861214ef3ba647d3ac83152df4e3e9bbe9eeea1e5f

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:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:UAC_bypass_bin_mem
Create hunting rule
Author:James_inthe_box
Description:UAC bypass in files like avemaria

File information

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

Cape
Cape
https://www.capesandbox.com/analysis/144929/

Comments