Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 0c027a6aa4595846…

MALICIOUS

Office (OLE) / .DOC

84.2 KB Created: 2021-01-04 16:48:00 Authoring application: Microsoft Office Word
MD5: db74b33012bff06e61271094c65c333f SHA-1: 0e1f622923f3857fa6efafb43a1bc7ad30c48ffe SHA-256: 0c027a6aa4595846e283cda59937646f25218ff56ebdc4170a65d4af4dcefdd6
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains a VBA macro that executes upon opening the document. This macro utilizes obfuscated API calls to instantiate 'Scripting.FileSystemObject' and subsequently creates several files on the local filesystem, such as 'X:\LmwjH\nWkpD.VDluJ'. This behavior suggests the macro is designed to download and execute further malicious payloads or establish persistence.

Heuristics 6

  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • 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.
  • 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.

FilenameKindSourceSize
macros.bas
5413d2ebbaf274555cb07937d347084313a81ca863adee8961dbe3c4d35cf167		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7277 bytes

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