Office (OOXML) / .XLSX malware analysis — malicious · 0d89ab0b02d0fc98

MALICIOUS

Office (OOXML) / .XLSX

117.2 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-15

MD5: c792a13f872e0915f1180df663309294 SHA-1: 02522552e678ccca9bf8e488a1059892e3c0db34 SHA-256: 0d89ab0b02d0fc989175bbecf32cd39f889c03d02e8542ddc6ca8417e9dd6ab6

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The file contains multiple Excel 4.0 macro sheets, identified by the OOXML_XLM_MACROSHEET heuristic. These macros appear to be designed to download and execute a second-stage payload, as indicated by the presence of 'urlmon', 'kern', and 'el32' strings which are likely related to URL fetching and execution. The ClamAV detection of 'Multios.Malware.Agent' further supports its malicious nature.

Heuristics 2

Excel 4.0 macro sheet (12 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.
ClamAV: Multios.Malware.Agent-10042426-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Multios.Malware.Agent-10042426-0

Extracted artifacts 12

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `e541f768a6a2761f1eb330f36fa4854aa79d685e958fba24945d0f470a5c8620`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin	871 bytes
`xlm_sheet_01.bin` `0d0844264380b8dadbba0d2074e9c73b38a92bd41acd11a8911bcf11bfae4dd2`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.bin	674 bytes
`xlm_sheet_02.bin` `fcbee97f0dd0396d2166b27e70dc5f329138d91e33cacefc90780771d2c89aca`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3588 bytes
`xlm_sheet_03.bin` `9a9c00e5c670d9cb9ebbebc0e8eb74c5dbab1cc8cd9e7ffb4a8841887c938b52`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin	1269 bytes
`xlm_sheet_04.bin` `b8caa8271c2f12b728bdb0b32921f704c74d345971d996e432db17dc7447a0c1`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin	737 bytes
`xlm_sheet_05.bin` `5acb5cd8473f658ac1af292f8be69bb3d1e3ad2da2b48975c4cdcaf26c0ce9b9`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet4.bin	674 bytes
`xlm_sheet_06.bin` `9c7f0265f4841d89c0d2dbb41a0e7ff0d6f6e1eee1f2521467877a38b47fdaf2`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.bin	672 bytes
`xlm_sheet_07.bin` `266823ec560e31f11854528dcc8a208cadf42a92be72a59d3e08dff40b2cf09a`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.bin	562 bytes
`xlm_sheet_08.bin` `59abb19e07a0c85880d3e936983a6afd5475b6de992fac76e4164836c9f8539c`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.bin	393 bytes
`xlm_sheet_09.bin` `3568da1cb305e32670f31b9f2e0e2e544620438fc48e5295397de622e00e563d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.bin	442 bytes
`xlm_sheet_10.bin` `49977c4c3cbb189580a89e6d184b0137682ae93d0aa4c13b2c8b6bb201cf7535`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.bin	754 bytes
`xlm_sheet_11.bin` `a6ac0305669a45ec3d5a9c0fdb6bc74f328641eb09ba1853fc9972b2728de61d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet7.bin	393 bytes

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