Qbot Office (OLE) / .XLS malware analysis — malicious · aff999aa8b0cb088

MALICIOUS

Office (OLE) / .XLS

582.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: eca8073cf661515fb1460f6d9db0d2e7 SHA-1: dce0c5debf1615eef93e07eca1189b9468f36396 SHA-256: aff999aa8b0cb088f858429aeb0f18dd81337981f807c7aa98d95d9ddae34050

140 Risk Score

Malware Insights

Qbot · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is an Excel spreadsheet containing VBA macros, specifically an Auto_Open macro, which is a common delivery mechanism for Qbot. The ClamAV detection explicitly identifies it as 'Xls.Downloader.Qbot'. The Auto_Open macro is designed to execute automatically when the document is opened, likely to download and execute a second-stage payload. The VBA code itself appears to be primarily for UI manipulation, but the presence of the Auto_Open macro and the ClamAV signature strongly indicate malicious intent.

Heuristics 4

ClamAV: Xls.Downloader.Qbot-b760f03263b7c21b-9950248-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Qbot-b760f03263b7c21b-9950248-0
Auto_Open macro high OLE_VBA_AUTO

Auto_Open 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `5d1184f7d77bd58c13a19286c88a6639a7de7c99b2d47ca67964e471859ab37c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6354 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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