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

Static analysis result for SHA-256 af2579406307b5d3…

MALICIOUS

Office (OOXML) / .XLSM

87.0 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: f9f639de2178c5b5dd60e4ea427135e9 SHA-1: 81c34e439d24ec1fdc7a3077ee9a4139f6471d6a SHA-256: af2579406307b5d3b8aa6c1f771722bb92636a5fd06c89c4f4f4df0ca92348fb
320 Risk Score

Malware Insights

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

The sample is an XLSM file containing VBA macros, including an Auto_Open macro, which is a common delivery mechanism. It exploits CVE-2017-11882 via an embedded Equation Editor object. The Equation Editor's native stream contains a command stager that executes `cmd /c ren %tmp%\mm v&wSCRIPT %tmp%\v..wsf ..C...`, indicating it attempts to download and execute a second-stage payload using wscript.

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
248ee48172b844cdd70db6c6e3eead928735f7ea28c8232e8498629365a4b385		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 30770 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
54f3cd34b1bd8a4bb86a2db4adea660a27ebc89ec851ad8d2566787864b90417		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 12800 bytes
ooxml_oleobject_00_ole10native_00.bin
92072b25c4805dca6e6440ad09e733e73d03d4fd5bbc57eafce2ca7328e76094		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 9954 bytes
ooxml_oleobject_01.bin
122908edb698f6463b9cb8149e31d3d7b5554b0763a82e820b336f1109cacd20		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_02.bin
341e747d08498c92c5c771d519d50eea5cc09b1a2eb63458c82d298e7919cb6d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_02_ole10native_00.bin
92e9e2bc6661e5814f516be651c3fe6feb204e19ce7272b7c4adc6d84c03f7d2		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1244 bytes
ooxml_oleobject_03.bin
496475eca8333e85111eff837364215ee8e28cd77325e7fea2c073c21209bc9e		 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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