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

Static analysis result for SHA-256 81abe96eebca2540…

MALICIOUS

Office (OLE) / .DOC

42.0 KB Created: 2021-06-06 21:10:00 Authoring application: Microsoft Office Word
MD5: 486f829d1fe33ce134468174a9afc3b1 SHA-1: c27f71d37fc1c02cd4ec15becc57343bcc219b17 SHA-256: 81abe96eebca2540994d7fc63bbaf9a4a2f584a0d004d33c20f7027b8923b996
382 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains a Document_Open VBA macro that uses WScript.Shell to execute a PowerShell command. This command downloads a second-stage executable from the URL https://33655990.cyou/1111/2222/333333/p222.ex and saves it as C:\Users\Public\Documents\bookwith.ex, which is then executed. The obfuscated nature of the shell command and the use of WScript.Shell indicate a malicious intent to download and run a payload.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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.
  • NOP-equivalent sled detected medium SC_NOP_EQUIV_SLED
    Long run of 0x40 bytes
  • 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://33655990.cyou/1111/2222/333333/p222.ex
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
aeea84c1358cc455dff57e15b5179162c413027cb3cbcc613188ee388e337441		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 789 bytes

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