Office (OLE) / .XLS malware analysis — malicious · e1993021c0575594

MALICIOUS

Office (OLE) / .XLS

181.5 KB Created: 2022-07-25 06:50:07 Authoring application: Microsoft Excel First seen: 2022-07-25

MD5: 99b0d7e756929269944541b4f61c933d SHA-1: ca240ce3d177dcf7bf16d289a8499e604d59aaed SHA-256: e1993021c0575594ff63f2685d56f1e80c60d6fc67e5e86ff1c5ef7b25f773d5

362 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The Workbook_Open macro in the VBA script utilizes WScript.Shell and Microsoft.XMLHTTP to download a file from the hardcoded URL 'http://192.168.1.100/payload.exe' and execute it. This indicates a downloader functionality designed to fetch and run a secondary payload.

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` `e4935df2afb712c162543e289a5782d4e3999d973ac07ea64fb143201d05d4bd`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	38694 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 77 long base64-like blob(s).

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