Emotet Office (OLE) / .XLSX malware analysis — malicious · 1ba8667195835be9

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 262a055d95e93edd960629cac98f61be SHA-1: ec882369266848f01757e5fbb474b5b736b5867f SHA-256: 1ba8667195835be983eb4eeaeedd15b75474518654562494009414518152adbb

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for Emotet. The script attempts to download and execute a second-stage payload from a list of URLs. The reconstructed command line indicates the use of PowerShell with base64 encoded arguments, likely to execute the downloaded payload. The presence of Wscript.Shell and CreateObject calls further supports this malicious intent.

Heuristics 7

ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
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` `006c4f4d54d1c9bb906763adb0bd849cdbbe9d88f3fa78ad2d18ef6987f96c37`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	8906 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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