Qbot Office (OOXML) / .XLSX malware analysis — malicious · 1c7829f0316c7aeb

MALICIOUS

Office (OOXML) / .XLSX

266.2 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-02-24

MD5: 90a6e1ce293fc4639c1d458aff26096d SHA-1: a079d51bcd3a2fde3e374a65532c6e7484804d04 SHA-256: 1c7829f0316c7aeb94e0887bedf93e3667ab1283659bb1e3d5bcb2860d609ec1

180 Risk Score

Malware Insights

Qbot · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic

The sample is identified as malicious by ClamAV as Xls.Downloader.Qbot02221-9940029-0. It contains multiple Excel 4.0 macro sheets, a common technique for delivering Qbot. The embedded macro content, though obfuscated, suggests it is designed to download and execute a secondary payload, which is characteristic of Qbot's downloader functionality.

Heuristics 3

Excel 4.0 macro sheet (13 sheet(s)) critical OOXML_XLM_MACROSHEET

Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.
XLSB international XLM macro sheet hidden in .xlsx critical OOXML_XLSB_INTL_MACROSHEET_IN_XLSX

OOXML package is named .xlsx but contains XLSB workbook parts and an international Excel 4.0 macro sheet. This hides XLM macro execution from scanners that trust the extension or only inspect XML worksheet parts. The technique is macro execution, not a document-parser CVE.
ClamAV: Xls.Downloader.Qbot02221-9940029-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Qbot02221-9940029-0

Extracted artifacts 13

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `5fb5a9e6ec1dacc189efcc6a68093d9b5c376b223dcb27f862984427d2aac0e2`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin	363 bytes
`xlm_sheet_01.bin` `dbdd4c1c8ee187d7c5430fa758515ddd8be11b44c3b4435564e175e4a11d05c3`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin	792 bytes
`xlm_sheet_02.bin` `da4a3dd20598f5d8cf5375967227afea2603380fd81d339abf64327e3e444bad`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	2964 bytes
`xlm_sheet_03.bin` `7a9cb9f51e53cfc400e9eca3f75c6728794c807d79bae3ce31a35ca308c38b42`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin	1248 bytes
`xlm_sheet_04.bin` `d7bed8c1f8d3057a1f3cf0b173e48bf44e4199fb1fc946acce5befaaa8bdb880`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.bin	619 bytes
`xlm_sheet_05.bin` `4d4dd95373ceffcdeae0a74dfa09b90bd3ce229ab64dd70c7fe0f05e5b469bbd`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.bin	648 bytes
`xlm_sheet_06.bin` `8d957f41705fc5da60f409cd3c460bdb601935e6214bf78485f23a85cb252024`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.bin	622 bytes
`xlm_sheet_07.bin` `000bc8d70715fdc1e9f90bbf8ea8d827eb7d942c3f16b2c5b6d16539d6622ba7`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet7.bin	446 bytes
`xlm_sheet_08.bin` `3d7da882103e152fa19e77064137c97829f1e1a274c1affe1fac1b61da777fbd`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.bin	801 bytes
`xlm_sheet_09.bin` `617d9277b8cae5e22b22f75d36f1c1410a208c497dfd9b1fc50732ce8b8e39ba`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.bin	423 bytes
`xlm_sheet_10.bin` `d5c4686b042d6a3a5b3054f9a908261594b4da3bb58f47c7667d2f76807eef6e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.bin	686 bytes
`xlm_sheet_11.bin` `d70f9ec0a416d2c5d576f663a61e87e9c0546f1f91643f12f3b384ea04845e91`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet4.bin	726 bytes
`xlm_sheet_12.bin` `2bd138650fa507a83c5a96a8b7ece29759f24ed721eaf50eae3ada328413aacb`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet9.bin	423 bytes

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