Emotet Office (OLE) / .XLSX malware analysis — malicious · 3ea88b25770547ff

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 09c4f8effba56276b961923eb49a74c0 SHA-1: 34a9afae86979b5b2cd62d312cb7c2df4d0df110 SHA-256: 3ea88b25770547ffb2fdc852e4c9ebb5f0cdac77676b99a7b090af7d500db946

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample contains a Workbook_Open macro that utilizes CreateObject to instantiate Wscript.Shell, indicating an intent to execute commands. The document body contains a heavily obfuscated string that, when partially decoded, reveals multiple URLs likely used to download and execute a second-stage payload. The presence of Wscript.Shell and the obfuscated download URLs strongly suggest a downloader functionality, consistent with the Emotet family.

Heuristics 7

ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
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` `d6216b1540c6d866e0cdc66ed3bfa2b79b477655c56d42a698e7b407351a97e3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6560 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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