Emotet Office (OOXML) / .XLSX malware analysis — malicious · b202282a15802608

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 353ffad4ca0d1476a93f14b98b210a45 SHA-1: 059b5a3602f5165fd8eae14f510c321743d5547a SHA-256: b202282a1580260848d74fe94b55fdfb76bcd37f3593ac4335b99447723a7c1a

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel document containing a Workbook_Open macro, a common technique for Emotet. The macro uses CreateObject to execute a downloaded payload. The DOC BODY contains obfuscated commands that reconstruct multiple URLs and filenames, including 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat', which are likely used to download and execute further stages of the malware. The ClamAV detection ID also strongly suggests Emotet.

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` `2bdf6284571c304fa1832ae47ede6f52b6c9cc36fcb8283f4e346c110bac1861`	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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