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

Static analysis result for SHA-256 04a08e1dca690908…

MALICIOUS

Office (OLE) / .BIN

60.5 KB
MD5: a9b94edcb6dcac27438f9a51c7ab60b5 SHA-1: 707291a1f5a95b6b6f7675bd3f27e13da849ac48 SHA-256: 04a08e1dca69090863ba589e4c4116c373bcb776900dba305c17f157be405c39
330 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains obfuscated VBA macros with AutoOpen and Workbook_Open triggers, indicating an attempt to automatically execute malicious code upon opening. The presence of CreateObject and Shell() calls suggests the macro is designed to download and execute a second-stage payload, likely using PowerShell or another interpreter. The specific payload and its destination are not directly discernible due to obfuscation and truncation.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • NOP-equivalent sled detected medium SC_NOP_EQUIV_SLED
    Long run of 0x41 bytes
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6817ac55cc270dfbb2dce58720ce6e51941cca0bbf594fbe9ceb36f9c8ceebb9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14068 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).

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