Office (OOXML) / .XLSM malware analysis — malicious · b30b8ec72d07e0c6

MALICIOUS

Office (OOXML) / .XLSM

49.4 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000

MD5: 1224afaf6db695c73cf40abda6e11e2c SHA-1: 49866aa96c7fc48e26488acd613d999b761499f7 SHA-256: b30b8ec72d07e0c6f25e38006e7f73c4490234ee147fcdc8049ac63644c3e6b5

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment T1204.002 Malicious File

The presence of an Auto_Open macro and an embedded Equation Editor OLE object strongly suggests malicious intent. The macro likely leverages the embedded object to execute a secondary payload. The heuristic firings indicate a sophisticated approach involving obfuscation and encoded blobs, typical of macro-based malware delivery.

Heuristics 6

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject3.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `039633bbec7c2fb0a2be346586697ac5862e78a07d45d6639dd1a9b08fea7e97`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	53746 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`ooxml_oleobject_00.bin` `7fd2f990e10ba06b1abbe4b4e06ac7b1a6910947b82df34e13a5c53b74471dc4`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject3.bin	5936 bytes
`ooxml_oleobject_01.bin` `e23bd96cf6134f1323b9a80e2ebe0fad5c804dcab886a950823d3a7bc2e847f1`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	3584 bytes
`ooxml_oleobject_01_ole10native_00.bin` `ffc90c2d477626bde7fe23eae852efc723c60a263a8f31e487436bcf08b66c2e`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	1183 bytes
`ooxml_oleobject_02.bin` `f498cca708a49cce52d0cec34a53db770f679d67223cd7d2a0e9b8bcd9881ffa`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject2.bin	12288 bytes
`ooxml_oleobject_02_ole10native_00.bin` `ec7cd584b45f4e5ce0095888ddc4eace6716d4970ebda6bf1e3687532881e311`	ole-package	OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native	9268 bytes
`ooxml_oleobject_03.bin` `bff2d48b141139a1d72f027e19eec89573fb02bb941513e235eb2e6dc98fb4f0`	ooxml-ole-object	OOXML embedded OLE part: xl/vbaProject.bin	98304 bytes
`emf_00.emf` `979dde2aed02f077c16ae53546c6df9eed40e8386d6db6fc36aee9f966d2cb82`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	4968 bytes
`emf_01.emf` `4d4d1e7b04c99dcb8e885915068ad6f74cc2333e91580cdae5ccaa00c427247f`	ooxml-emf	OOXML EMF part: xl/media/image2.emf	1536 bytes

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