IcedID Office (OOXML) / .XLSM malware analysis — malicious · 0e4d3bacb407e851

MALICIOUS

Office (OOXML) / .XLSM

342.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300

MD5: 3070fd3f7066fe89a3f6e3c6acc21092 SHA-1: 5b3d789d75dd19d156e01a042c80b04e2a22359c SHA-256: 0e4d3bacb407e851590657e2d6c98ac9060fdf7bc5a479119cae71e90c01ca45

250 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK

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

The file is an XLSM document containing Excel 4.0 macros, as indicated by multiple critical heuristic firings. These macros utilize dangerous functions like FORMULA and CALL to construct and execute commands. Specifically, the macros appear to construct a command to download and execute a second-stage payload using 'regsvr32 -s .\Post.storg' and similar variations. This behavior is consistent with IcedID, a known downloader and banking trojan.

Heuristics 6

Excel 4.0 macro sheet (10 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.
Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAME

Workbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
Dangerous XLM formula APIs: FORMULA, RUN, HALT, GOTO critical OOXML_XLM_DANGEROUS_FN

Excel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
ClamAV: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 14 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.microsoft.com/office/excel/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `77a2552a35104367f799f4096b3ae4c8171ee2e5ee3a4b5270fe06a86f7bc3fd`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	3661 bytes
`xlm_sheet_01.xml` `ef4beac33700e9f3fc349170f198acb43da249b168ba90039feac302d6144012`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	1791 bytes
`xlm_sheet_02.xml` `28f37cd7b934a54360fd11ea13360f01a00631f48eb50671062ca2150546ffe1`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml	2323 bytes
`xlm_sheet_03.xml` `f52a1fe96d1e917dc5a90da756eacb9f414bac9843fbf067523f895adb4624ef`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml	1438 bytes
`xlm_sheet_04.xml` `f4f64564e97e71d44e1503c633738ac0b750b2ac1025ed07c37397cf3fb87238`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml	1503 bytes
`xlm_sheet_05.xml` `6dd2f8642c594514fca348a16d2e9641b3492a2cd0476b30212f180cdabb1f1f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml	1441 bytes
`xlm_sheet_06.xml` `507d7abac4580456d533403d676f5f72786f3c74d36e6ad1bbb4f9f627dea886`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet7.xml	1440 bytes
`xlm_sheet_07.xml` `e92dea39619a5dcfdc889538b2980bccadbad3dc9a8c34752db39769a0e204b9`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.xml	1442 bytes
`xlm_sheet_08.xml` `62fd2f53a7df5bfcdb8649d1defc1852b3e408758e6bca949c6ddee9cc672834`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet9.xml	1485 bytes
`xlm_sheet_09.xml` `9f2c348b6277949a52e634dd134eba0fdcf672840d76d752a3cea0b5f52fb2aa`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1428 bytes

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