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

Static analysis result for SHA-256 3aae6daed910bbe2…

MALICIOUS

Office (OLE) / .XLS

105.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel
MD5: 0cd49295e80faf170c9e409086877aab SHA-1: 007cc9b559a17e742b9946913fe2a3ae2220af81 SHA-256: 3aae6daed910bbe29974e3c7182a68712681a16f78e1718476a00245039a3108
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The critical heuristics OLE_VBA_SHELL, OLE_VBA_WSCRIPT, and OLE_VBA_OBFUSCATED_SHELL_URL indicate that the VBA macros are designed to execute commands via WScript.Shell. The Workbook_Open auto-execution and the obfuscated shell command containing a URL strongly suggest the intent is to download and run a second-stage payload from the provided IP address.

Heuristics 9

  • 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.
    URL http://209.141.61.124/Q-2/IMG_065017223.ex
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7746429120ddfb5b08a41cac329b36ca1f12d182016238985c6c7e4fd07cb2a2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1122 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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