MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
The sample is identified as malicious by ClamAV and exhibits critical heuristic firings for Excel 4.0 macros and reassembled XLM payloads. The embedded XLM macro sheet contains functions like 'URLDownloadTo' and 'Create', strongly suggesting the intent to download and execute a second-stage payload, consistent with Qbot downloader behavior. The presence of 'uRlMon' as a reassembled payload name further supports this.
Heuristics 3
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Excel 4.0 macro sheet (12 sheet(s)) critical OOXML_XLM_MACROSHEETSpreadsheet 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.
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XLM payload reassembled from CHAR()/split formulas critical OOXML_XLM_REASSEMBLED_PAYLOADAn Excel 4.0 macro sheet builds its payload inside the formula token stream by concatenating per-character CHAR() calls and string fragments, so no WinAPI name, shell command, or URL is ever contiguous in the .bin for a literal-bytes scan to find. Reassembling the formulas recovered download/execute API names, LOLBin commands (regsvr32/rundll32/mshta/wmic/powershell), or a payload URL — the de-obfuscated download-and-run kill chain.
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ClamAV: Xls.Downloader.Qbot03221-9942499-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.Qbot03221-9942499-0
Extracted artifacts 12
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.bin9649d9ad4c39f240db9abbf6b64da8e6abcc65e137ead106264913da49beef5b |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin | 1308 bytes |
xlm_sheet_01.bin687fdf76d29f0c6431ab5692dfed6286b8d8737722a30bb60032b8ee9eaedde2 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.bin | 2723 bytes |
xlm_sheet_02.bin8ff76b252ceeba1f05df1248bd8803bdb4add7b14449876f11efd1faba3e0bce |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin | 1289 bytes |
xlm_sheet_03.binc00c83141fd8cd5545aacde5198b88eda848b709924e3b46fe90b5e1e4f2a5bc |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin | 773 bytes |
xlm_sheet_04.bin551885fcbd386ecf55907f97c9fef3b2aef7468b3700ad1b82e2928a7cc0abe3 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.bin | 672 bytes |
xlm_sheet_05.bin64cefe187b9bc3f58b3831e06892a6f20a972a991bb8e56878bd75017788f902 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.bin | 562 bytes |
xlm_sheet_06.bind85c821431c9f022e62357cf58036f46139eaddd46235d3576ec1dd3ea6cf33f |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet6.bin | 442 bytes |
xlm_sheet_07.bin1e17ca5892c49a5cea3471253f1819054f7474285cee062faf67e975692f44ad |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.bin | 714 bytes |
xlm_sheet_08.binb5fa3c6dcbced786fc63ea82b656a070157c6756dda9bed3682c78cad26d0ec5 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet7.bin | 393 bytes |
xlm_sheet_09.bin864c5104912084b3c739f8a7d5f8e693b57f0cb1ad06d9668564b0ad84102180 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.bin | 634 bytes |
xlm_sheet_10.bin05634df2d86c1eafc6eb9f167c644a623f2755f69c080a109004182ceaff5db5 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet4.bin | 634 bytes |
xlm_sheet_11.bin056c1e6dde570e2c179c5874e851ad32e4435a6998f118e41add2ab263b28f62 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet8.bin | 393 bytes |
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