Emotet Office (OLE) / .XLSX malware analysis — malicious · da643ff56cd1f940

MALICIOUS

Office (OLE) / .XLSX

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

MD5: f5a1d68c25c78b83f6a7709d2508d7b8 SHA-1: ef8bcc59df32554a3905d07fb14d1577a2585df0 SHA-256: da643ff56cd1f94099dc5b3ea852b363ec79f92ad080a5edbb301438cd275185

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1059.001 PowerShell

The file contains VBA macros, specifically a Workbook_Open event, which is a common delivery mechanism for Emotet. The macro executes obfuscated VBScript and batch commands. The batch script attempts to download payloads from multiple URLs, including 'http://youlandao.org/eln-images/n8DPZISf/', 'http://roseevideo.net/eln-images/EjdcOMlY8Gy/', and 'http://vbaint.com/eln-images/H2pPgtE8XzENc/'. The VBScript part, reconstructed from the base64 encoded string, also contains a list of URLs that are likely used to download additional stages of the malware. The presence of Wscript.Shell and CreateObject calls further supports the malicious intent of downloading and executing arbitrary code.

Heuristics 7

ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
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` `faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13985 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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