SYMBOLCOMMON_NAMEaka. SYNONYMS
win.dadjoke (Back to overview)

DADJOKE

Actor(s): Leviathan


DADJOKE was discovered as being distributed via email, targeting a South-East Asian Ministry of Defense. It is delivered as an embedded EXE file in a Word document using remote templates and a unique macro using multiple GET requests. The payload is deployed using load-order hijacking with a benign Windows Defender executable. Stage 1 has only beacon+download functionality, made to look like a PNG file. Additional analysis by Kaspersky found 8 campaigns over 2019 and no activity prior to January 2019, DADJOKE is attributed with medium confidence to APT40.

References
2020-02-07Medium SebdravenSébastien Larinier
@online{larinier:20200207:40:9415c5c, author = {Sébastien Larinier}, title = {{APT 40 in Malaysia}}, date = {2020-02-07}, organization = {Medium Sebdraven}, url = {https://medium.com/@Sebdraven/apt-40-in-malaysia-61ed9c9642e9}, language = {English}, urldate = {2020-02-09} } APT 40 in Malaysia
DADJOKE
2020-01-03Youtube (BSides Belfast)Brian Bartholomew
@online{bartholomew:20200103:nice:ddc5c57, author = {Brian Bartholomew}, title = {{Nice One, Dad: Dissecting A Rare Malware Used By Leviathan}}, date = {2020-01-03}, organization = {Youtube (BSides Belfast)}, url = {https://www.youtube.com/watch?v=vx9IB88wXSE}, language = {English}, urldate = {2020-01-13} } Nice One, Dad: Dissecting A Rare Malware Used By Leviathan
DADJOKE
2019-11-05Brian Bartholomew
@online{bartholomew:20191105:dadjoke:81e2a63, author = {Brian Bartholomew}, title = {{DADJOKE}}, date = {2019-11-05}, url = {https://prezi.com/view/jGyAzyy5dTOkDrtwsJi5/}, language = {English}, urldate = {2020-01-07} } DADJOKE
DADJOKE
2019-08-13奇安信威胁情报中心
@online{:20190813::eae3d10, author = {奇安信威胁情报中心}, title = {{洞察人性:一起利用政治人物桃色丑闻的诱饵攻击活动披露}}, date = {2019-08-13}, url = {https://wemp.app/posts/80ab2b2d-4e0e-4960-94b7-4d452a06fd38?utm_source=latest-posts}, language = {Chinese}, urldate = {2020-01-13} } 洞察人性:一起利用政治人物桃色丑闻的诱饵攻击活动披露
DADJOKE
2019-07-26Twitter (@a_tweeter_user)a_tweeter_user
@online{atweeteruser:20190726:malware:dce6863, author = {a_tweeter_user}, title = {{Tweet on Malware}}, date = {2019-07-26}, organization = {Twitter (@a_tweeter_user)}, url = {https://twitter.com/a_tweeter_user/status/1154764787823316993}, language = {English}, urldate = {2020-01-08} } Tweet on Malware
DADJOKE
2019-03-27Twitter (@ClearskySec)ClearSky Cyber Security
@online{security:20190327:timelines:36e1fb0, author = {ClearSky Cyber Security}, title = {{Tweet on "Timelines - ECRL.docx"}}, date = {2019-03-27}, organization = {Twitter (@ClearskySec)}, url = {https://twitter.com/ClearskySec/status/1110941178231484417}, language = {English}, urldate = {2020-01-08} } Tweet on "Timelines - ECRL.docx"
DADJOKE
Yara Rules
[TLP:WHITE] win_dadjoke_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_dadjoke_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dadjoke"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 50 ff15???????? 6800040000 e8???????? }
            // n = 4, score = 500
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6800040000           | push                0x400
            //   e8????????           |                     

        $sequence_1 = { 50 ff15???????? c3 55 8bec f6450801 }
            // n = 6, score = 500
            //   50                   | push                eax
            //   ff15????????         |                     
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   f6450801             | test                byte ptr [ebp + 8], 1

        $sequence_2 = { 56 57 6800081000 6a00 }
            // n = 4, score = 500
            //   56                   | push                esi
            //   57                   | push                edi
            //   6800081000           | push                0x100800
            //   6a00                 | push                0

        $sequence_3 = { ff7510 e8???????? 59 c3 8bff 55 }
            // n = 6, score = 500
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp

        $sequence_4 = { 6a00 6a00 ff15???????? 6808020000 }
            // n = 4, score = 500
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   6808020000           | push                0x208

        $sequence_5 = { ffd0 8b4dfc 8b11 8b45fc 50 }
            // n = 5, score = 400
            //   ffd0                 | call                eax
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   50                   | push                eax

        $sequence_6 = { 50 8b4d08 8b510c 52 ff15???????? 8945f0 837df000 }
            // n = 7, score = 400
            //   50                   | push                eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b510c               | mov                 edx, dword ptr [ecx + 0xc]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   837df000             | cmp                 dword ptr [ebp - 0x10], 0

        $sequence_7 = { 8d8518f9ffff 50 8d8d24fcffff 51 68???????? 6804010000 }
            // n = 6, score = 400
            //   8d8518f9ffff         | lea                 eax, [ebp - 0x6e8]
            //   50                   | push                eax
            //   8d8d24fcffff         | lea                 ecx, [ebp - 0x3dc]
            //   51                   | push                ecx
            //   68????????           |                     
            //   6804010000           | push                0x104

        $sequence_8 = { e8???????? c3 6a04 e8???????? 59 c3 6a0c }
            // n = 7, score = 300
            //   e8????????           |                     
            //   c3                   | ret                 
            //   6a04                 | push                4
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   6a0c                 | push                0xc

        $sequence_9 = { 0f94c1 8bc1 c3 a1???????? c3 }
            // n = 5, score = 300
            //   0f94c1               | sete                cl
            //   8bc1                 | mov                 eax, ecx
            //   c3                   | ret                 
            //   a1????????           |                     
            //   c3                   | ret                 

        $sequence_10 = { ff15???????? 85c0 7417 b920000000 }
            // n = 4, score = 300
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7417                 | je                  0x19
            //   b920000000           | mov                 ecx, 0x20

        $sequence_11 = { 5d c3 6a00 680033a084 6a00 6a00 6a00 }
            // n = 7, score = 200
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   6a00                 | push                0
            //   680033a084           | push                0x84a03300
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_12 = { f3a4 68???????? ff15???????? 8bf0 8975f4 }
            // n = 5, score = 200
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   68????????           |                     
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   8975f4               | mov                 dword ptr [ebp - 0xc], esi

        $sequence_13 = { ff15???????? 85c0 0f888b000000 8b85e4faffff 8d95f0fcffff 52 }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f888b000000         | js                  0x91
            //   8b85e4faffff         | mov                 eax, dword ptr [ebp - 0x51c]
            //   8d95f0fcffff         | lea                 edx, [ebp - 0x310]
            //   52                   | push                edx

        $sequence_14 = { f2e96b030000 55 8bec 8b450c 83e800 }
            // n = 5, score = 200
            //   f2e96b030000         | bnd jmp             0x371
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   83e800               | sub                 eax, 0

        $sequence_15 = { 8d4590 c745f400000000 6a00 50 }
            // n = 4, score = 200
            //   8d4590               | lea                 eax, [ebp - 0x70]
            //   c745f400000000       | mov                 dword ptr [ebp - 0xc], 0
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_16 = { 837c240800 75be ddd8 db2d???????? b802000000 833d????????00 0f8560140000 }
            // n = 7, score = 200
            //   837c240800           | cmp                 dword ptr [esp + 8], 0
            //   75be                 | jne                 0xffffffc0
            //   ddd8                 | fstp                st(0)
            //   db2d????????         |                     
            //   b802000000           | mov                 eax, 2
            //   833d????????00       |                     
            //   0f8560140000         | jne                 0x1466

        $sequence_17 = { ff5108 8b85e4faffff 50 8b08 }
            // n = 4, score = 200
            //   ff5108               | call                dword ptr [ecx + 8]
            //   8b85e4faffff         | mov                 eax, dword ptr [ebp - 0x51c]
            //   50                   | push                eax
            //   8b08                 | mov                 ecx, dword ptr [eax]

        $sequence_18 = { 8d95f0fcffff 52 50 8b08 ff5150 }
            // n = 5, score = 200
            //   8d95f0fcffff         | lea                 edx, [ebp - 0x310]
            //   52                   | push                edx
            //   50                   | push                eax
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   ff5150               | call                dword ptr [ecx + 0x50]

    condition:
        7 of them and filesize < 344064
}
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