Emotet Office (OLE) / .XLS malware analysis — malicious · f70d3cdae5a4702f

MALICIOUS

Office (OLE) / .XLS

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

MD5: 09d09c4816db43b0fa4a84507bbb1abb SHA-1: 4bc8a24fe44b273c2bdcf59ed985b60db437220e SHA-256: f70d3cdae5a4702f3ae4a9b286297a50f15b7289058edec9886446fd5516ff05

320 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic

The critical ClamAV detection and high-severity heuristics for PowerShell and Wscript indicate a downloader. The Workbook_Open macro is designed to execute obfuscated PowerShell commands. The script reconstructs a list of URLs from which it likely downloads and executes a second-stage payload, and it uses a base64 encoded string that decodes to a list of URLs and a command to write a DLL to 'c:\programdata\' and execute it via rundll32.exe.

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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