Emotet Office (OLE) / .XLSX malware analysis — malicious · a92f2df22b1c7b96

MALICIOUS

Office (OLE) / .XLSX

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

MD5: efc4be26856e7bfd6d65f1efc1cbe1ce SHA-1: 26bdf98b5b9cb0fb2123d9231d54614561113e9d SHA-256: a92f2df22b1c7b9632196bd3ed8819669b2c34d41d19dd212ea0bc9d4b9636fc

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample is identified as malicious by ClamAV with a signature indicating it's a downloader, likely related to Emotet. The Workbook_Open macro is configured to execute a series of commands. These commands involve creating a VBScript file at 'c:\programdata\yhjlswle.vbs' and a batch file at 'c:\programdata\ughldskbhn.bat'. The batch file then attempts to download payloads from multiple URLs, including 'http://santoertillla.com/_baks/tUX9/', and execute them. The VBA script's primary function is to orchestrate this download and execution process, leveraging Wscript.Shell.

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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