Xls.Dropper.Valyria-10030821-0 Office (OOXML) / .XLSM malware analysis — malicious · 22bdef5cc6ea5cf8

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 7b6cecf774d570ce9487e3ef5fda1b0e SHA-1: 96f2e99f28689eb59fc1d33bcefe34c023a88e29 SHA-256: 22bdef5cc6ea5cf826d7c62a2c1d293f40e1da26507e9de59f76c76588aeb426

360 Risk Score

Malware Insights

Xls.Dropper.Valyria-10030821-0 · confidence 95%

MITRE ATT&CK

T1204.002 Malicious File Execution: User Execution of Malicious Code T1559.001 Component Object Model Hijacking: Component Object Model T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is an XLSM file containing VBA macros and an embedded Equation Editor OLE object. Critical heuristics indicate the exploitation of CVE-2017-11882, which is used to execute a command-line stager. This stager likely downloads and executes a second-stage payload, consistent with the 'Valyria' dropper family identified by ClamAV. The presence of an Auto_Open macro further supports the automated execution of malicious code upon opening the document.

Heuristics 9

CVE-2017-11882 — Equation Editor command stager critical CVE likely CVE_2017_11882_EQUATION_NATIVE_CMD

Embedded Equation Editor OLE data contains an invalid Equation Native/MTEF stream with an embedded command stager. This is likely CVE-2017-11882 exploitation because the vulnerable Equation Editor component is reached and the malformed native stream directly carries process-launch bytes.
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.
ClamAV: Xls.Dropper.Valyria-10030821-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Valyria-10030821-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
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
Suspicious extracted artifact medium 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.

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `1124514a239a7e3ca2276d19ce0f8ead38935dede9cc22382c69fff0fdebda6d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	269296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 shell/COM execution token(s).
`ooxml_oleobject_00.bin` `7534e6489758dbf42222d5978158b808b605a59059550fd7cd79095480c2160a`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject3.bin	5936 bytes
`ooxml_oleobject_01.bin` `deff641c6cc6c2c4347d8d44e42d0acc28ffbc07693bdcb4d45e38c54d93658d`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	4608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 shell/COM execution token(s).
`ooxml_oleobject_01_ole10native_00.bin` `a4bd9d543e9e552c16464ca85672b63ebb996d4118ebbefba72d91e71674f86a`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	2254 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 shell/COM execution token(s).
`ooxml_oleobject_02.bin` `a1a11d6783bf6f74626dcfed6505a5f39df157887181f8104540318ca1d46795`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject2.bin	70144 bytes
`ooxml_oleobject_02_ole10native_00.bin` `af490955bd659dba4425c4d62fd32dd8a557422892b47241cc4d0c6f774c75c4`	ole-package	OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native	66883 bytes
`ooxml_oleobject_03.bin` `c9540165fb2be3b7b25abfbf505858fa85a28db200479464d93700d7c951df0e`	ooxml-ole-object	OOXML embedded OLE part: xl/vbaProject.bin	325632 bytes
Detection ClamAV: Xls.Dropper.Valyria-10030821-0 Obfuscation or payload: unlikely
`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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