Office (OLE) / .XLS malware analysis — malicious · b0767288761dd0de

MALICIOUS

Office (OLE) / .XLS

47.0 KB Created: 2010-03-31 13:06:36 Authoring application: Microsoft Excel

MD5: 67fcac6cfcbe7988c29e986916715a80 SHA-1: 056c355a5aa0bb53bfab4ff46f089ab752172883 SHA-256: b0767288761dd0de7876b3d2e5e37d0d3ece8accab4cb56904fae361d7558755

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1140 Deobfuscate or Obfuscate

The sample is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro that is configured to execute automatically. The document body prompts the user to enable macros to view information, a common social engineering tactic. The Workbook_Open macro likely uses ShellExecute, LoadLibrary, and GetProcAddress APIs to execute embedded malicious code, potentially an embedded PE executable. No specific family could be identified, but the techniques suggest a macro-based downloader.

Heuristics 10

Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute 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
Embedded PE executable high OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `5da83b5ffc496a1f5a87333e4c20907a4f0025a6ef0b2ac87871a936b95b9e56`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4364 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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