Office (OLE) / .XLS malware analysis — malicious · 4d3509404975ac2f

MALICIOUS

Office (OLE) / .XLS

325.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-12-12

MD5: 1e55e38e66412f537356d20393129372 SHA-1: 580cffc35861ea1be69a68217e1e191280dbbc95 SHA-256: 4d3509404975ac2f99aa7075754c08feec46d0dbffe0f8d9e0ff764aee6c95f9

422 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 malicious VBA macros, specifically a Workbook_Open macro that utilizes WScript.Shell to download and execute a file. The script appears to be obfuscated, but the critical heuristic firings indicate a high likelihood of it downloading and executing a second-stage payload. The presence of the 'macros.bas' artifact further supports this. The exact download URL and executed payload could not be fully reconstructed due to obfuscation.

Heuristics 10

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.
ClamAV: Xls.Malware.Valyria-10032137-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10032137-0
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` `7230f71349dd2f8004205b5799e4e4d71d93349fee507ce87b9fca414996b816`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	29390 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 113 long base64-like blob(s).

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