Emotet Office (OOXML) / .XLSX malware analysis — malicious · ed1d95cf03d5aa9b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 26825d78fddd35db0dee06f8c0980784 SHA-1: 76356edc670f1cf2dcbb3a53cab172080129f508 SHA-256: ed1d95cf03d5aa9bd88640f290490315952b9f2aaf5f7ea87552dece2ebae57e

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file contains a Workbook_Open macro that executes a VBScript payload. The script is obfuscated but appears to download and execute additional malware from multiple URLs. The ClamAV detection name 'Xls.Downloader.EmotetRed02221-9938910-0' strongly suggests the Emotet family. The script also attempts to write to 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat'.

Heuristics 5

ClamAV: Xls.Downloader.EmotetRed02221-9938910-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetRed02221-9938910-0
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` `de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12808 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` `b7000078bc943fc3d44952dabb29da621819ce93056913def3ce239054e0f387`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 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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