Office (OLE) / .XLSX malware analysis — malicious · 8d37ad6b25946f22

MALICIOUS

Office (OLE) / .XLSX

26.5 KB Created: 2022-06-08 06:50:44 Authoring application: Microsoft Excel First seen: 2022-06-09

MD5: 03c5907be9346926791d17361c6b67ba SHA-1: 4c52716cde30b648a45294a6db408863f09ce020 SHA-256: 8d37ad6b25946f22e426626e8c25727b4be3821813a7c60db44f2b1974633ef9

302 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The VBA macro within this XLSX file is designed to execute a secondary payload. Specifically, it constructs and writes a JavaScript file named 'olapappinuggerman.js' to the user's public directory. This script then downloads content from 'http://www.asianexportglass.shop/p/25.html' and executes it using mshta. This indicates a downloader or droppper functionality.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
ClamAV: Xls.Malware.Valyria-10002968-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10002968-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.asianexportglass.shop/p/25.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `5fabfc60299e83f53aca1d2b6d45f666c12cc873d28f4e76a2f0d66c2ca3a894`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1145 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).

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