Emotet Office (OLE) / .XLSX malware analysis — malicious · fa5a7100003f9b1d

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: a86270a698e6c91e1cc94113606607ab SHA-1: 1ce8302a2384efe1d1246f886d35d73b28c1e168 SHA-256: fa5a7100003f9b1dab2742da3f2fd1b302c719bbc3cdffc572aaab42cceba7c5

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The file contains VBA macros that are automatically executed upon opening the workbook, as indicated by the Workbook_Open heuristic. The script uses `CreateObject("Wscript.Shell")` to execute commands. It reconstructs and runs the VBScript `c:\programdata\yhjlswle.vbs` and the batch file `c:\programdata\ughldskbhn.bat`. The batch file appears to be constructing a command line that includes multiple URLs, suggesting a downloader functionality. The presence of 'Emotet' in the ClamAV detection name further supports this assessment.

Heuristics 7

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 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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