Emotet Office (OLE) / .XLSX malware analysis — malicious · 56191fc048d2a7c2

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 7ad16ba23ce1ea6dbb3cbf00d5d070fd SHA-1: 28871ac9d04ffeb5c48b85125d10f5143b6c1671 SHA-256: 56191fc048d2a7c2c58ce8ae081dc523252bebaf385d193ee82ccc997c5d9ecb

320 Risk Score

Malware Insights

Emotet · confidence 90%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.001 PowerShell T1059.003 WScript T1059.001 name: PowerShell T1105 Ingress Tool Transfer

The sample is a malicious Excel file containing a Workbook_Open macro that executes a PowerShell loader. The PowerShell script, found in the document body, is Base64 encoded and once decoded, reveals a sequence of multiple C2 URLs. The script uses Get-Random to Get-Random to generate a random filename in C:\programdata\ with a .dll extension, and attempts to download the same from one of the listed URLs. The ClamAV detection specifically attributes this to Emotet.

Heuristics 8

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

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
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` `2371f091b169c7918c945b8974b3f60437212f84d1a9d429701826689481f8d8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6376 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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