Office (OLE) / .XLA malware analysis — malicious · b1f4311010175fcd

MALICIOUS

Office (OLE) / .XLA

2.67 MB Created: 1998-08-04 04:04:19

MD5: c1128fccf26f1824143504996dc22e9a SHA-1: 00278042250fb933ea978cf835d74918670009ab SHA-256: b1f4311010175fcdfbdd9ee1bbce8cd4cee57a11475322b9eaa2ebc86d886d17

320 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel Macro-Enabled Add-In (XLA) containing a large VBA macro. Heuristics indicate the presence of LoadLibrary, Shell(), CreateObject, and auto-execution via Workbook_Open, strongly suggesting the execution of arbitrary code. The VBA p-code auto-execution with execution tokens further supports this. The macro is likely designed to download and execute a second-stage payload, but no specific URLs or hashes were extracted to confirm this. The document body contains Japanese text related to data logging and configuration, which may be a lure or unrelated to the malicious functionality.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close 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.

Filename	Kind	Source	Size
`macros.bas` `4886fa2788792f8f62ff5023f458ae91e7434a9ff293453f4d560053fe52d368`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1128296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 92 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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