Xls.Dropper.Sdrop-9451844-0 — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 ad6cc6ef96ae6c58…

MALICIOUS

Office (OOXML) / .XLSM

48.3 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: d372b36656cff469f8d52896488ab69e SHA-1: e3888d4a530a8f631e53545d0a4a9a7c86d9ff5e SHA-256: ad6cc6ef96ae6c58566b341987992a8516adf346fd0d869d5bcd7fa3b34a5bd2
320 Risk Score

Malware Insights

Xls.Dropper.Sdrop-9451844-0 · confidence 95%

MITRE ATT&CK
T1204.002 User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic

The XLSM file contains a VBA project with an Auto_Open macro, which is a common delivery mechanism for malware. The critical heuristic CVE_2017_11882_EQUATION_NATIVE_CMD indicates that the sample exploits a known vulnerability in the Equation Editor to execute a command-line stager. This stager is designed to download and execute a second-stage payload, as suggested by the ClamAV detection name 'Xls.Dropper.Sdrop-9451844-0'.

Heuristics 8

  • 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.Sdrop-9451844-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Sdrop-9451844-0
  • 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.

FilenameKindSourceSize
macros.bas
af45acb6d17552be81db8ea8d588a31ac2af5e0b5f182b0e9e8e9127c179fc66		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 30798 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
ooxml_oleobject_00.bin
545491c7a68bf353fd68ccb24b4b25d2336757fc792608dc78ee5787ace836c1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 12800 bytes
ooxml_oleobject_00_ole10native_00.bin
5662143bf89b483491081ed7a1586ee13c12aa92dce65d975150bfee77066f63		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 9982 bytes
ooxml_oleobject_01.bin
341e747d08498c92c5c771d519d50eea5cc09b1a2eb63458c82d298e7919cb6d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_01_ole10native_00.bin
92e9e2bc6661e5814f516be651c3fe6feb204e19ce7272b7c4adc6d84c03f7d2		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1244 bytes
ooxml_oleobject_02.bin
122908edb698f6463b9cb8149e31d3d7b5554b0763a82e820b336f1109cacd20		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_03.bin
31acbf585d0159eed7dabc03bf5cfc68dc9cb497e543e12b67e4537192f12765		 ooxml-ole-object OOXML embedded OLE part: xl/vbaProject.bin 50176 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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