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

Static analysis result for SHA-256 dab67d7c151ff32e…

MALICIOUS

Office (OOXML) / .XLSM

97.3 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: cd7b1bc01f2f52ee9e00128c902a7453 SHA-1: 1296a5acfda0c9a69b74aad50f84a06d570ca155 SHA-256: dab67d7c151ff32eb072d6894aafa0aa8ee78626be5c4ab37fbec853d6f8c1a4
360 Risk Score

Malware Insights

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

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1566.001 Phishing: Spearphishing Attachment T1059.005 Command and Scripting Interpreter: Visual Basic

The file is an XLSM document containing VBA macros, including an Auto_Open macro, which is a common delivery mechanism. It exploits CVE-2017-11882 using an embedded Equation Editor object to execute a command stager. This stager likely downloads and executes a second-stage payload, as indicated by the ClamAV detection name 'Xls.Dropper.Valyria-10030821-0'.

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.

FilenameKindSourceSize
macros.bas
424fa180a7574ee8165b86b8d5c6509f4c4c95dc59b73afaf5ac5e9f9ffef486		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 115389 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 9 shell/COM execution token(s).
ooxml_oleobject_00.bin
8283f4912fa59efc01ebdf0bc19947f260a10fd8f9d5971776ad1ef496023185		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_01.bin
53fd261bd4fa27552355febe539e7b6d17e70724672f7ea63935e284a7d87aa8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 55808 bytes
ooxml_oleobject_01_ole10native_00.bin
fd4d912a5d86e7560ed3332cb582bc2c084a7805b814f18ca7fcd0dd466391ea		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 52955 bytes
ooxml_oleobject_02.bin
3dd8917885c33ce2510455444f64529545217be743a30d61ddddf4d964a0689b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 18944 bytes
ooxml_oleobject_02_ole10native_00.bin
fd6071ed8eab1944cb457ef545f1d94dbb814c53b2dee8092e5ddf19417dd337		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 16251 bytes
ooxml_oleobject_03.bin
258b94619b9615cff6db888aa21db2bdbf7aaa991f70934be2ff11f6004556c8		 ooxml-ole-object OOXML embedded OLE part: xl/vbaProject.bin 158720 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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