Office (OLE) / .XLSX malware analysis — malicious · 1c409fee36dda533

MALICIOUS

Office (OLE) / .XLSX

708.5 KB Created: 2021-05-09 17:11:10 Authoring application: Microsoft Excel

MD5: eab9dd0c6c9970b12851dc56c8e77ebb SHA-1: 0ce87f1116fe287bc9415a051af23c81d27449c1 SHA-256: 1c409fee36dda5337ef340dd480d92fbf68da68bee2a28f267def6bbb63755f6

348 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel file containing VBA macros, including an AutoOpen and Workbook_Open subroutine. These macros utilize URLDownloadToFile and ShellExecute, indicating an intent to download and execute a second-stage payload. The presence of these functions and auto-execution triggers strongly suggests a downloader or droppper malware.

Heuristics 9

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
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
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` `fb5f2d18299b42f7f1333e0fa6dfbfa6a08c3acfa3f3c66920ca5ec6ad4f0e75`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	16177 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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