SquirrelWaffle Office (OLE) / .XLSX malware analysis — malicious · 1bf28e7bb5cf75e0

MALICIOUS

Office (OLE) / .XLSX

843.5 KB Created: 2015-02-24 20:54:23 Authoring application: Microsoft Excel

MD5: 265bf3f895cfcecc94de530dbf7b2bc5 SHA-1: 0f2115d35c8ac8640016670bef080f85c7bbaa89 SHA-256: 1bf28e7bb5cf75e005c6a8f647b7cd0a6a5b5e1455a8a902a81aef774aac27e6

242 Risk Score

Malware Insights

SquirrelWaffle · confidence 95%

MITRE ATT&CK

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

The file is identified as malicious by ClamAV with the signature Xls.Downloader.SquirrelWaffle20921-9895790-0. Static analysis detected VBA macros, including an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The script utilizes the URLDownloadToFile API to download a payload from the embedded URL 'https://exascale.ca/m1.dll', indicating a downloader functionality consistent with the SquirrelWaffle family.

Heuristics 7

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
ClamAV: Xls.Downloader.SquirrelWaffle20921-9895790-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.SquirrelWaffle20921-9895790-0
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
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 https://exascale.ca/m1.dll

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `146c044008256769f1ec6ffb9bfbd2906248ac66b41a5b52b383c397aa7d1fff`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3437 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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