Emotet Office (OLE) / .XLSX malware analysis — malicious · 34650f13254a8d10

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: ed2b6de9dd53202650903ea093bb15b0 SHA-1: 65f7001ec996f623603d929ce66feb0f640e15fa SHA-256: 34650f13254a8d100b5937e0676b961901573acd258721a7714039b236e50bb9

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The critical ClamAV detection and high-severity heuristics for VBA macros, specifically a Workbook_Open auto-execution, strongly indicate malicious intent. The VBA script itself contains a message box and a loop of user prompts, likely designed to socially engineer the user into enabling further malicious actions. The script also attempts to execute a batch file and a VBScript, which are likely responsible for downloading and executing additional payloads from the reconstructed URLs. The presence of 'Emotet' in the ClamAV detection name further supports the family attribution.

Heuristics 7

ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13985 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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