IcedID Office (OOXML) / .XLSM malware analysis — malicious · 3786f30bd73fdd01

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 53f563d17135ccce3cc945bab947a49b SHA-1: bb38d2034f285651008c053919e9ce46b0c92fe5 SHA-256: 3786f30bd73fdd01bbdabecad82886bc21133ef9ab0cd4f50c217cb8761e1f05

250 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: User Execution: Malicious File T1105 Ingress Tool Transfer

This XLSM file contains multiple Excel 4.0 macro sheets, including hidden ones, which is a common technique for malware delivery. The critical heuristic firings indicate the use of dangerous XLM formula APIs like FORMULA, GOTO, and HALT, which are used to download and execute payloads. The ClamAV detection explicitly names the IcedID family, confirming its malicious nature and likely function as a downloader.

Heuristics 6

Excel 4.0 macro sheet (14 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, GOTO, HALT 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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
URL http://schemas.openxmlformats.org/spreadsheetml/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/excel/2006/main
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 14

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `c6147ff1756152612e015f11f7e76a298540d74ec9f27d60e9424ceeba013de4`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	1378 bytes
`xlm_sheet_01.xml` `c82a3f1a5a07e2c3dfdeeb07a65d6c60c5bde7fafc322a698567c77157ce96d2`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	1616 bytes
`xlm_sheet_02.xml` `2d666c0156d5379ae66f25c08b3a2af99682820e2f3d34113e67d10adba7eb62`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml	2222 bytes
`xlm_sheet_03.xml` `20e6290160bfadd25f3737fb9a4c7de8d9795c3ac07efa3dfdae5b83fdab33ca`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml	3416 bytes
`xlm_sheet_04.xml` `0fa907f0718ae60f98439b6a09d6cf4f7408c685c3ab42cf2e66dd6c8f5eca42`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml	2313 bytes
`xlm_sheet_05.xml` `d426f8d1ffb9f4cae0b3596b59264854211f5a37409aff811f2b6e3d0b4471fc`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml	1743 bytes
`xlm_sheet_06.xml` `7c938a7bb5e1d49c23f50c7382eb8d69094ccdb58d4425ca8ed1a35098f12ad9`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet7.xml	1740 bytes
`xlm_sheet_07.xml` `722e5d05ff76efbc613cfc8faf6010a45d36bce5b42c805efd4dad491ab57285`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1585 bytes
`xlm_sheet_08.xml` `bbabdb72f964374a773f09d55c2ef66fa57494857b47c84f6883880468c3e05f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.xml	1795 bytes
`xlm_sheet_09.xml` `ac778404697adf8cbceb8a1b633b36eb8c3fda9b46e00508508936ce6239b05a`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet9.xml	1993 bytes
`xlm_sheet_10.xml` `613d62be3275fa90c8df8e3f1e1f8caeb9243ce5936b8c9f3471552d7ebb532a`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet10.xml	1972 bytes
`xlm_sheet_11.xml` `d3102bf6b88d9e01a5dbc52a16f13df3a504db274cc3a3cd2ab29863d465b4d0`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet11.xml	1914 bytes
`xlm_sheet_12.xml` `d99e10e24d53b02909de21dd754f15976c7c796354e67cdb1257e34ad2556597`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet12.xml	2194 bytes
`xlm_sheet_13.xml` `f132f4041e583271c3d5f2834d2cb24dbe90419bc9d67396179c90ec86cd5770`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1442 bytes

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