Office (OOXML) / .XLSX malware analysis — malicious · 91290bbc24fce32c

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 268d4003a7dcb201682a1c07b932babe SHA-1: 2b891038648f1d4e468fbf9c739181e0929e5404 SHA-256: 91290bbc24fce32c528ef5d7a2d5a3b319539ac1d2c494d4d519327832c5e3d9

380 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file contains VBA macros, including an Auto_Open macro, which is designed to execute automatically upon opening. The macros utilize WScript.Shell and CreateObject to execute a Base64-decoded command that downloads a PE file from 'http://88.218.16.37/RYgaf2SOmQopR6Y.exe'. This indicates a downloader or droppper functionality.

Heuristics 9

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.
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
VBA Base64-decoded Shell command stager critical OLE_VBA_BASE64_SHELL_COMMAND_STAGER

VBA auto-exec macro decodes Base64 string literals into command or script-launch text and executes the result with Shell. This catches cmd/cscript/PowerShell/VBS launchers hidden from plain keyword matching.

URL http://88.218.16.37/RYgaf2SOmQopR6Y.exe
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.

Filename	Kind	Source	Size
`macros.bas` `1fca2d97f85307720970c8de4031468fe67bd6c79e03dffb483a2b36d2eb6bc4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	45425 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution 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` `a4f59656683ba59e88c59cd48669fdb10f2ffd049d16777678129a93c52a2cf0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject3.bin	5936 bytes
`ooxml_oleobject_01.bin` `dd9e5740136684ac2561805e0f182b78cc8beb26bf79876f8dd080a78f11a3a3`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject2.bin	10240 bytes
`ooxml_oleobject_01_ole10native_00.bin` `a4e9a995cce4b58393836a701ee0725763549c445c80cf33b402c0fa1e02e16c`	ole-package	OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native	7317 bytes
`ooxml_oleobject_02.bin` `6e29d7d282332f1f7ae3aaacc6044c018dfbaddc1479da1a785d5141657b1040`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	3584 bytes
`ooxml_oleobject_02_ole10native_00.bin` `b7d4ecda1a8b2ac7dddb10bfc77eb599ac8b16b7e133ca7aa3523495ccd6a3f4`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	967 bytes
`ooxml_oleobject_03.bin` `f21f27372794efa3c8bab3dc39ad5cfd23af1cf4b118680e8767e3d5efa2fde5`	ooxml-ole-object	OOXML embedded OLE part: xl/vbaProject.bin	73216 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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