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

Static analysis result for SHA-256 ae3051a76889ad58…

MALICIOUS

Office (OOXML) / .XLSM

70.6 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: cc0f9ba3b5b0628125897166ae4285c2 SHA-1: 5c5f48a92e67995875864c0de1e2d1d19a83fa01 SHA-256: ae3051a76889ad583f1a1e782b785f91684c59260b1816326efc4c548fd7510b
360 Risk Score

Malware Insights

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

The presence of an Auto_Open macro and an embedded Equation Editor OLE object strongly indicates exploitation of CVE-2017-11882. The Equation Editor object contains a command stager that executes a script from a temporary file, likely to download and run a second-stage payload. ClamAV detection further confirms its malicious nature as 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
ddd3b17d0a9466753f258ce76715b5753980c555b9e619eaf04ffdb64ead111b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 267910 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 9 shell/COM execution token(s).
ooxml_oleobject_00.bin
bc553e6f9f26166f4cce594974e0ff8bf099c0c4fd9c32aaa25efab154307219		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 70144 bytes
ooxml_oleobject_00_ole10native_00.bin
0060ef03d492385338c489882cd19e37b0e31e8431a130a3d140ed7d77bd33d5		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 66883 bytes
ooxml_oleobject_01.bin
11cfa84c9c50e6150f54746c3a6716a119e5af5d6a47302ad37f5e4781c08efb		 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
7534e6489758dbf42222d5978158b808b605a59059550fd7cd79095480c2160a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_03.bin
8ebcad90700b604fd52e0831e4ec97510be5270d569b001b1c496d8fc70d9711		 ooxml-ole-object OOXML embedded OLE part: xl/vbaProject.bin 324096 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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