Emotet Office (OOXML) / .XLSX malware analysis — malicious · 7cfde58ba011cda7

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: af856d261370ebf17b941355cbfbd04f SHA-1: 89e6ca474f87e52a895cec046b092366b1a5e6e5 SHA-256: 7cfde58ba011cda76b127cf27ac6ba140763641bca3eb695f1e3ea856722fb3a

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetRed02221-9938910-0', strongly suggesting the Emotet family. The presence of a Workbook_Open macro and CreateObject calls indicates the execution of VBA code upon opening. The extracted document body contains obfuscated commands that reconstruct to `wscript.shell` and `cmd.exe` calls, along with multiple URLs that are likely used to download and execute a second-stage payload. Specifically, the script attempts to execute `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` `b2f0c43d545b8e17f6384eb282cd245e1bf6a0dadcf00712fcdb56f466652b69`	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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