Office (OLE) / .XLS malware analysis — malicious · ec623337e17c8a9b

MALICIOUS

Office (OLE) / .XLS

241.0 KB Created: 2025-06-13 20:31:03 Authoring application: Microsoft Excel

MD5: b935c6e33853d2bb0aa2131db51b4d38 SHA-1: c7e835404bd7ae608231eaf0ea0db4a04362f4d1 SHA-256: ec623337e17c8a9b0cd636c905b9b1e474040516e7bd4cb6fdc45310ecf2181c

308 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLS file containing VBA macros. A critical heuristic firing indicates the presence of URLDownloadToFile within the VBA code, and a high-severity heuristic confirms this is triggered by the Workbook_Open auto-execution macro. This suggests the macro is designed to download and execute a second-stage payload from a remote URL, which is a common initial access technique for malware.

Heuristics 8

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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` `c5adc5b8558677f9ebbf1cab5b17594205003696ca620c4d885f46d8ea2ce008`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7767 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

Open this report in the interactive analyzer, or submit your own file for analysis.