Emotet Office (OOXML) / .XLSX malware analysis — malicious · c91080d5863cc22e

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 16a66ff0c60b9d8d8a0747f1becb339e SHA-1: 5d88333919de9c1099807ca3e9a641a7e3e7891a SHA-256: c91080d5863cc22e6ba58c7e4c405d015a14a0c875e24bda0548772b57e769fd

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is identified as a malicious Excel document by ClamAV, specifically flagged as an Emotet downloader. High-severity heuristics indicate the presence of a Workbook_Open macro and CreateObject calls, common for initiating malicious actions. The embedded VBA script contains heavily obfuscated PowerShell commands that, when deobfuscated, reveal multiple URLs from which a second-stage payload is likely downloaded and executed. The script also references batch and VBScript files in the programdata directory, suggesting further stages of execution or persistence.

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` `b4e77782eb09700e14845b82afe40beb12d38b2421eb530495d5079a470b2500`	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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