Emotet Office (OOXML) / .XLSX malware analysis — malicious · efbea1e600917350

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 5512d60d7179051ea717422db2a4d528 SHA-1: 44bdce28a22b9480b6df497797ddcf93c0702cf4 SHA-256: efbea1e600917350a42c2fdd2584c61b2190bfcf6e35722cf6ef2b336ebf3c0c

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is detected as Emotet by ClamAV and contains a Workbook_Open macro, indicating it's designed to execute malicious code upon opening. The embedded VBA script, while partially obfuscated, reconstructs multiple URLs that are likely used to download and execute a second-stage payload. The script also attempts to create batch and VBScript files in the programdata directory. The presence of a Workbook_Open macro and the reconstructed URLs strongly suggest a downloader functionality characteristic of Emotet.

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` `4177022d07a10a1d2d2cccec30dca9b21e326c9454c375eff3b574784c1e4a58`	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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