Qbot Office (OLE) / .XLS malware analysis — malicious · 6ca376cd53db43cc

MALICIOUS

Office (OLE) / .XLS

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

MD5: b34551496a7754456ed9c2ee18332299 SHA-1: 96c5c422004450e392dd7f0552df8e17ab0167e3 SHA-256: 6ca376cd53db43cc7781db3e03782ab28213ed722a52e0d38927d3aba516d9b6

220 Risk Score

Malware Insights

Qbot · confidence 95%

MITRE ATT&CK

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

The file is an Excel spreadsheet containing VBA macros, including Auto_Open and Auto_Close functions, which are commonly used for malicious execution. Critical heuristics indicate obfuscation of the 'URLDownloadToFile' API, suggesting the macro's intent is to download a second-stage payload. The ClamAV detection explicitly names this as a Qbot variant, a known banking trojan.

Heuristics 5

Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION

VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
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
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `192cfaca1136f955376cce32bb837c69a73e3a301014f5c3fc5c454e88d99cc0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6223 bytes

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