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

Static analysis result for SHA-256 676dba21ec8f582b…

MALICIOUS

Office (OLE) / .PPT

374.0 KB Created: 2020-02-24 11:35:37 Authoring application: Microsoft Office PowerPoint
MD5: 9b931be51cba475496d0a924de4d7f23 SHA-1: 0c464a03f733137f3a9c9ca11781b77a1cd7e1e5 SHA-256: 676dba21ec8f582b2ad9f836168518bd601048be69d444f7779ff2016aea4997
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

This PowerPoint file contains VBA macros with critical heuristic firings for Shell() calls and obfuscated API names, specifically reassembling the token 'mshta'. The Auto_Close macro is designed to execute automatically, and the presence of 'Shell()' and 'CallByName' suggests the execution of external commands. The script's intent is to download and execute a second-stage payload, likely via mshta, which is a common technique for initial execution.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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 https://stackoverflow.com/questions/1057670/create-a-new-object-using-the-text-name-of-the-class
    • http://%20%20%20%2020%2020%2020%2020%20@bit.ly/4knaskn4kand
    • https://stackoverflow.com/questions/31234805/err-raise-is-ignoring-custom-description-and-source

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8d90aef0a5187b208f4aa42d9bb3145faa91c1a75dddc01e2e82efef8bf9e7c6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 71738 bytes

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