Office (OOXML) malware analysis — malicious · 7c5c37896ade3681

MALICIOUS

Office (OOXML)

82.1 KB Created: 2021-07-13 12:00:46 UTC Authoring application: Microsoft Excel 16.0300

MD5: 0b08c71a2e5f4cd9f5441f5cdc9745b2 SHA-1: 3998bfd591cb500f003665b1dfdee3f14b879832 SHA-256: 7c5c37896ade36815d25fe7cdb33c90215314a371b64e98694af6942360b5637

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The OOXML document contains a Workbook_Open macro that references PowerShell and cmd.exe, and uses CreateObject. This suggests the macro is designed to execute a command, likely to download and run a second-stage payload. The presence of the 'VBA RunPE' script further supports this, indicating an intent to execute external code. The URLs found point to resources related to RunPE implementations, reinforcing the malicious nature.

Heuristics 7

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://github.com/itm4n/VBA-RunPE
- https://github.com/hasherezade/
- https://www.codestack.net/visual-basic/algorithms/data/encoding/base64/
- https://www.codestack.net/license/
- https://www.codestack.net/visual-basic/algorithms/data/encoding/base64/�
- https://www.nirsoft.net/kernel_struct/vista/IMAGE_DOS_HEADER.html
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms680305(v=vs.85).aspx
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms680313(v=vs.85).aspx
- https://msdn.microsoft.com/en-us/library/windows/desktop/ms680339(v=vs.85).aspx
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms680336(v=vs.85).aspx
- https://www.nirsoft.net/kernel_struct/vista/IMAGE_SECTION_HEADER.html
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms684873(v=vs.85).aspx
- https://msdn.microsoft.com/en-us/library/windows/desktop/ms686331(v=vs.85).aspx
- https://www.nirsoft.net/kernel_struct/vista/FLOATING_SAVE_AREA.html
- https://msdn.microsoft.com/en-us/library/windows/desktop/ms679284(v=vs.85).aspx
- https://www.nirsoft.net/kernel_struct/vista/IMAGE_DOS_HEADER.html�

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `17520e413bebd7a2b274a18c8bfb1780b46b93e30b7bf043e4a8cefe423c78de`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	55432 bytes
`vbaProject_00.bin` `88604d76812e1d47caa15d81131fbde63fb88f96b7a1a11d24eb652ea0dab277`	vba-project	OOXML VBA project: xl/vbaProject.bin	167424 bytes

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