Emotet Office (OOXML) / .XLSX malware analysis — malicious · dc4da478ef3a463c

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 9c6d8331af38346c2c00bb805f8c2f41 SHA-1: c2364c2e0979f05cddddb8d72856c1074dee1b3d SHA-256: dc4da478ef3a463c7b60dad9eaa4d0fc461503e1f5178851cdf9021092968c0e

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is an Excel document containing VBA macros, specifically a Workbook_Open macro, which is a common delivery mechanism for Emotet. The script attempts to create a shell object and execute a batch file named 'jledshf.bat' from the 'c:\programdata\' directory. It also constructs a URL from concatenated strings, which is likely used to download a second-stage payload. The ClamAV detection name 'Xls.Downloader.EmotetExcel02223-9938902-0' further supports the Emotet family attribution.

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` `10ea4e2e12c244bdb58c7127591a7ff9f256e288c5c831aac5491250fec77b63`	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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