Office (OLE) / .XLS malware analysis — malicious · 051851a940f92112

MALICIOUS

Office (OLE) / .XLS

108.5 KB Created: 2023-02-14 21:10:12 Authoring application: Microsoft Excel First seen: 2023-02-14

MD5: 7d9d74f288692c926db35569320ba58e SHA-1: e4906248df2ede9c6dc139bae06dd07400713da5 SHA-256: 051851a940f92112ddf290124d2cea4acd2d0d1f2522c8e942faef9ed6fff244

362 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File

This XLS file contains VBA macros that leverage WScript.Shell to download and execute a file. The Workbook_Open macro is triggered upon opening, indicating an automated execution flow. The presence of a 'macros.bas' artifact and the critical heuristic for downloading and executing a file via HTTP strongly suggest a downloader functionality.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `8ba34d63dd706b903b6c439f57c1877ebdc1ce39281c0df5f94bf1a4eed60dd5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	15253 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 69 long base64-like blob(s).

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