Office (OLE) / .XLS malware analysis — malicious · 713631583f9fa600

MALICIOUS

Office (OLE) / .XLS

607.0 KB Created: 2025-08-26 20:58:06 Authoring application: Microsoft Excel

MD5: fb8e598a053a551573f8e0da818a0331 SHA-1: 3c0cc0412d4210342f3fda30f1fa6e8faa0e20c2 SHA-256: 713631583f9fa6009da7ac91f5cedec41b057bc1a3d5819a8081517e1844bb60

468 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is an Excel file containing a Workbook_Open VBA macro that is designed to execute automatically when the workbook is opened. This macro performs several actions including copying the workbook, creating directories, and most critically, extracting and executing an embedded PE executable. The presence of the embedded executable and the auto-execution macro strongly indicate a malicious intent to deliver a secondary payload.

Heuristics 12

XOR-encoded strings (key 0x80) critical SC_XOR_ENCODED

Found 1 Windows library/API name(s) XOR-encoded with single-byte key 0x80: 'LoadLibraryW'
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
PEB access via GS segment (x64) high SC_PEB_ACCESS_X64

PEB access via GS segment (x64)
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `a659cbc2291640806b75e278cf14ec40715cba56f9fd0435d548d10d5a01f2ab`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	68408 bytes
`embedded_office_000038b9.exe` `f9f7c1b617afa3505c8cb8e57fd368090d48331245a2d69bff4c95ba9562f365`	embedded-pe	Office MZ+PE at offset 0x38B9	607047 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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