Qbot Office (OLE) / .XLS malware analysis — malicious · 6410cdf429baab84

MALICIOUS

Office (OLE) / .XLS

534.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-10-23

MD5: 65a32f108d3c8a6cc8d7813b9892a952 SHA-1: 58f1ec7f794a717acfef21f2e1718a80e76d41c5 SHA-256: 6410cdf429baab84d583828623814316317029059eb46d8eab9a755bf234c612

220 Risk Score

Malware Insights

Qbot · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

This XLS file contains VBA macros, including Auto_Open and Auto_Close functions, which are commonly used for malicious execution. The macros exhibit obfuscation, specifically reassembling the string 'URLDownloadToFile', indicating an intent to download a secondary payload. The script also constructs a command to execute 'regsvr32 -silent ..\Celod.wac', suggesting the downloaded payload will be executed. The ClamAV detection further confirms its malicious nature and identifies it as a Qbot variant.

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` `6e975c057e590861c6128ab401ae21bf378c17c629fd38de134b190793c442d7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3465 bytes

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