Office (OLE) / .XLS malware analysis — malicious · 68346d23f359a277

MALICIOUS

Office (OLE) / .XLS

251.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2023-01-03

MD5: 92c8fc3f3f5b60c1571c4999126a361c SHA-1: 4b5e4b5603019287fa6418755339c8c19cc06e5f SHA-256: 68346d23f359a27744b49d6ea9bd229f2929d1cee057670d2ba73545c0ba427d

362 Risk Score

Malware Insights

MITRE ATT&CK

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

The XLS file contains VBA macros, including a Workbook_Open event, which is a common technique for automatic execution upon opening. Critical heuristics indicate the use of WScript.Shell and a Shell() call, suggesting the execution of external commands. The critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' specifically points to VBA downloading a file via HTTP and saving it to disk, likely to execute a second-stage payload. No specific family could be identified, but the behavior is consistent with a macro-based downloader.

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` `e69e16f1c94b3b747b1924577415c9f0118440015fd96ef00281411615bbfbe5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	15211 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 69 long base64-like blob(s).

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