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

Static analysis result for SHA-256 79316b00e69fe834…

MALICIOUS

Office (OLE) / .XLS

89.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 3eda5d1e23bc7fc725a892fe25aafaf0 SHA-1: 8564865999a3bfbc27809a39db8437a7f198b494 SHA-256: 79316b00e69fe834c46c710106da165c80304671ecc093dacae878ed58415d35
502 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File

The Workbook_Open macro automatically executes upon opening the Excel file. It uses WScript.Shell and CreateObject to download a PowerShell script from http://176.65.134.79/hosting/maCRO.ps1 to C:\Temp\Y1.ps1 and then executes it. This indicates a downloader or initial access payload.

Heuristics 12

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • 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 PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://176.65.134.79/hosting/maCRO.ps1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c57e55b6c5ab08ee71c1a99f79834d4eb7164daa0f78ef2c7bb588c791207813		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2720 bytes

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