Emotet Office (OOXML) / .XLSX malware analysis — malicious · 4d80bb9d0dc53583

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: a5472f7c623c67a7dffe031c072c35f0 SHA-1: ffdffdddc141c6ed7ebc12c9128295498f2fe996 SHA-256: 4d80bb9d0dc53583ceb20e9af95f25f1ceeb33370f15c77ec6179e5fb76ec6b7

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The ClamAV detection explicitly names this as an Emotet variant. The embedded VBA code, specifically the Workbook_Open macro, triggers obfuscated PowerShell commands. These commands attempt to download and execute payloads from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBSbRH/', and also create batch and VBScript files on disk. The PowerShell command reconstructs a long string of URLs, indicating a downloader functionality.

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` `7e957a8e02964054b6667b4aacc3f8d7941ce49345f1b12c839e4683a49548a2`	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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