Emotet Office (OOXML) / .XLSX malware analysis — malicious · 2c556bdcd1675477

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: e6e4a11ac548c2165a663ae7d9945531 SHA-1: ed721d572872a59c0c4d8ee51ff5d97e5c532445 SHA-256: 2c556bdcd167547773f9df57d798f353714708a1b19976d33abea46c5990f8e8

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0'. Static analysis reveals a Workbook_Open macro that utilizes CreateObject to execute obfuscated PowerShell commands. The PowerShell command reconstructs a URL from concatenated strings: 'http://sumedahoonlin.com/wp-content/hyezNXJ30XQEVcBRH/', 'http://divachintex.com/wp-incudes/WWhWRks8KvzNFm6/', 'http://hotelalandmalab.com/1520/bUdhEPdf/', and 'http://shwenantawin.com/copma/XTnZii02vfg.'. These URLs are likely used to download and execute a second-stage payload. The macro also writes two files to disk: 'c:\programdata\jledshf.bat' and 'c:\programdata\tghklsd.vbs'.

Heuristics 5

ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `042941bb15b0dbfae60a85d4287b9610acfe4df6af2bd521b9c1bfb5039e2846`	vba-project	OOXML VBA project: xl/vbaProject.bin	42496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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