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

Static analysis result for SHA-256 6e7c1b4d9558e1b8…

MALICIOUS

Office (OLE) / .DOCX

45.0 KB Created: 2021-07-06 04:33:00 Authoring application: Microsoft Office Word
MD5: 57d4d5cc9f4c8478be83d6f7fd884a1d SHA-1: 85aa2d48b9a1a9e3f88fcd13c3033a573f2076a0 SHA-256: 6e7c1b4d9558e1b823d0a2f36ff401bff68501f5fbe56724ee41f601f3a92163
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1140 Deobfuscate/Decode Files or Information T1071.001 Web Protocols T1204.002 Malicious File

The sample contains VBA macros that utilize obfuscated API calls, including reassembling 'MSXML2.ServerXMLHTTP' to establish a connection to 'https://saervilohim.top/ecm/ibm/1633162677/feedback'. The script is designed to send data and likely download a second-stage payload, indicating a downloader or droppper functionality.

Heuristics 5

  • 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.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • 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 https://saervilohim.top/ecm/ibm/1633162677/feedback
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9e1eb914e18d991ee27946c134e43baf0d9ce56974549631ead8ea70c60f6bef		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2825 bytes

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