Office (OLE) / .XLSX malware analysis — malicious · 3a269c5f49b0424d

MALICIOUS

Office (OLE) / .XLSX

144.0 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel

MD5: 767b8c735f829a639f627a0f58850c48 SHA-1: dd86f89f87a20511543f7c6a7c2a08057cc73331 SHA-256: 3a269c5f49b0424d96851f50ab1dccd40a24aa20861f8a14a0aaaad7c335f3cc

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The file contains VBA macros, including a Workbook_Open subroutine, which is a common technique for executing malicious code upon opening. The script uses `CreateObject("Wscript.Shell")` to execute obfuscated commands, including the creation of a batch file at `c:\programdata\cbjwektde.bat`. The script also attempts to download payloads from multiple URLs, such as `http://altthyplan.com/wp-admin/ELW8YcOqJn/`, indicating an intent to fetch and execute further malicious content. The ClamAV detection as 'Doc.Downloader.EmotetExcel02226-9938630-0' further supports its role as a downloader.

Heuristics 7

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

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
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` `022b6ea87e671715cd07f596eceb5d45e85534a367868a0e820c8aa5cb013822`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6734 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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