Emotet Office (OLE) / .XLSX malware analysis — malicious · 39ebeef3ffb355bd

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 187255590f259b6ab287cfa8565a3c78 SHA-1: a9f5f83261a29efe60b675ecc90b55452d90d416 SHA-256: 39ebeef3ffb355bd7fa3da3ccc114f98f2035d85ed337539cf1079e10f3ab814

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetRed02220-9938909-0'. The VBA macros contain a Workbook_Open auto-execution routine that utilizes CreateObject to instantiate Wscript.Shell. This script then proceeds to construct and execute a command that downloads and saves two files, 'yhjlswle.vbs' and 'ughldskbhn.bat', to 'c:\programdata\'. The embedded script also contains a long, obfuscated string which, when reconstructed, reveals multiple URLs that are likely sources for further malicious payloads. The presence of Wscript.Shell, the download of VBS and BAT files, and the Emotet signature strongly indicate a downloader family, likely Emotet.

Heuristics 7

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 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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