Office (OLE) / .XLS malware analysis — malicious · c35a6ebdca67922e

MALICIOUS

Office (OLE) / .XLS

63.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2023-09-10

MD5: 84caa8d3849caeb4264e54aa95a81d70 SHA-1: 8e1eccae7927d8088e0fa502291d0ebae70ae0ff SHA-256: c35a6ebdca67922ec242d49395daebe8295a2508a6557a19e05ee75bef455702

422 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The Excel file contains a Workbook_Open VBA macro that utilizes WScript.Shell to create an object for executing commands. This macro is designed to download and execute a second-stage payload, as indicated by the critical heuristic 'OLE_VBA_HTTP_DROP_EXEC'. The script also references the 'Templates' special folder, suggesting a potential location for dropped files.

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` `706b794ade7cd3550f30f299a2e42dd070202f634dbb6259562e9c0bb4201ad2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	15819 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 69 long base64-like blob(s).

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