eb698e6735684fb5a87fe9cc8af2853e921efb80e91211207f85c2ecde960513

Analysis

max time kernel
49s
max time network
28s
platform
windows7_x64
resource
win7-20240221-ja
resource tags

arch:x64arch:x86image:win7-20240221-jalocale:ja-jpos:windows7-x64systemwindows
submitted
07/03/2024, 17:19

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General

Target

Serb.exe
Size

3.9MB
MD5

a4cd81c294c112fd82a4abcb2b6bebf0
SHA1

9143dce76ecb158ac50fc328f6ebad23bc762b21
SHA256

eb698e6735684fb5a87fe9cc8af2853e921efb80e91211207f85c2ecde960513
SHA512

6802e4e8ad8fb7f943cca9cac1c25813104db4de624023f4dd5b8f9d2c1dc1689b41de42dc2856cfe83d9ce3e68183ee4e6c7ba553abafef8a9aac7211904dbc
SSDEEP

98304:emY+C/pcz/FOXnkWYfLj18kH5PS5LPstLlgLJBHe2PU:emY+2pcyk1GaPS5jQLlaJU2PU

Score

7^/10

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
2536	autorun.exe
2684	B.exe

Loads dropped DLL 4 IoCs

pid	Process
2344	Serb.exe
2536	autorun.exe
2536	autorun.exe
2536	autorun.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 2 IoCs

evasion

pid	Process
2472	timeout.exe
2744	timeout.exe

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1658372521-4246568289-2509113762-1000\Software\Microsoft\Internet Explorer\Toolbar	POWERPNT.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-1658372521-4246568289-2509113762-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	POWERPNT.EXE
Key created	\REGISTRY\USER\S-1-5-21-1658372521-4246568289-2509113762-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	POWERPNT.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-1658372521-4246568289-2509113762-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	POWERPNT.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-1658372521-4246568289-2509113762-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	POWERPNT.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-1658372521-4246568289-2509113762-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	POWERPNT.EXE
Key created	\REGISTRY\USER\S-1-5-21-1658372521-4246568289-2509113762-1000\Software\Microsoft\Internet Explorer\MenuExt	POWERPNT.EXE
Key created	\REGISTRY\USER\S-1-5-21-1658372521-4246568289-2509113762-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	POWERPNT.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-1658372521-4246568289-2509113762-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	POWERPNT.EXE

Opens file in notepad (likely ransom note) 2 IoCs

ransomware

pid	Process
2720	NOTEPAD.EXE
2996	NOTEPAD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2700	POWERPNT.EXE

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2536	autorun.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeShutdownPrivilege	268	shutdown.exe
Token: SeRemoteShutdownPrivilege	268	shutdown.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2344	Serb.exe
2536	autorun.exe
2536	autorun.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 2344 wrote to memory of 2536	2344	Serb.exe	28
PID 2344 wrote to memory of 2536	2344	Serb.exe	28
PID 2344 wrote to memory of 2536	2344	Serb.exe	28
PID 2344 wrote to memory of 2536	2344	Serb.exe	28
PID 2344 wrote to memory of 2536	2344	Serb.exe	28
PID 2344 wrote to memory of 2536	2344	Serb.exe	28
PID 2344 wrote to memory of 2536	2344	Serb.exe	28
PID 2536 wrote to memory of 2684	2536	autorun.exe	30
PID 2536 wrote to memory of 2684	2536	autorun.exe	30
PID 2536 wrote to memory of 2684	2536	autorun.exe	30
PID 2536 wrote to memory of 2684	2536	autorun.exe	30
PID 2536 wrote to memory of 2684	2536	autorun.exe	30
PID 2536 wrote to memory of 2684	2536	autorun.exe	30
PID 2536 wrote to memory of 2684	2536	autorun.exe	30
PID 2684 wrote to memory of 2408	2684	B.exe	32
PID 2684 wrote to memory of 2408	2684	B.exe	32
PID 2684 wrote to memory of 2408	2684	B.exe	32
PID 2684 wrote to memory of 2408	2684	B.exe	32
PID 2408 wrote to memory of 1948	2408	cmd.exe	33
PID 2408 wrote to memory of 1948	2408	cmd.exe	33
PID 2408 wrote to memory of 1948	2408	cmd.exe	33
PID 2408 wrote to memory of 2472	2408	cmd.exe	34
PID 2408 wrote to memory of 2472	2408	cmd.exe	34
PID 2408 wrote to memory of 2472	2408	cmd.exe	34
PID 2700 wrote to memory of 3040	2700	POWERPNT.EXE	35
PID 2700 wrote to memory of 3040	2700	POWERPNT.EXE	35
PID 2700 wrote to memory of 3040	2700	POWERPNT.EXE	35
PID 2700 wrote to memory of 3040	2700	POWERPNT.EXE	35
PID 2408 wrote to memory of 2720	2408	cmd.exe	37
PID 2408 wrote to memory of 2720	2408	cmd.exe	37
PID 2408 wrote to memory of 2720	2408	cmd.exe	37
PID 2408 wrote to memory of 2744	2408	cmd.exe	38
PID 2408 wrote to memory of 2744	2408	cmd.exe	38
PID 2408 wrote to memory of 2744	2408	cmd.exe	38
PID 2408 wrote to memory of 268	2408	cmd.exe	39
PID 2408 wrote to memory of 268	2408	cmd.exe	39
PID 2408 wrote to memory of 268	2408	cmd.exe	39
PID 2408 wrote to memory of 2996	2408	cmd.exe	40
PID 2408 wrote to memory of 2996	2408	cmd.exe	40
PID 2408 wrote to memory of 2996	2408	cmd.exe	40

C:\Users\Admin\AppData\Local\Temp\Serb.exe
"C:\Users\Admin\AppData\Local\Temp\Serb.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2344
- C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\autorun.exe
  "C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\autorun.exe" "SFXSOURCE:C:\Users\Admin\AppData\Local\Temp\Serb.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2536
- - C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\AutoPlay\Docs\B.exe
    C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\AutoPlay\Docs\B.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of WriteProcessMemory
    PID:2684
  - - C:\Windows\system32\cmd.exe
      "C:\Windows\sysnative\cmd" /c "C:\Users\Admin\AppData\Local\Temp\7272.tmp\7273.tmp\7274.bat C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\AutoPlay\Docs\B.exe"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2408
    - - C:\Windows\system32\msg.exe
        
        msg * Error bad Gateway at {103} At Setup.exe
        5⤵
        
        PID:1948
    - - C:\Windows\system32\timeout.exe
        
        timeout /t 8
        5⤵
        Delays execution with timeout.exe
        
        PID:2472
    - - C:\Windows\system32\NOTEPAD.EXE
        
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\note.txt
        5⤵
        Opens file in notepad (likely ransom note)
        
        PID:2720
    - - C:\Windows\system32\timeout.exe
        
        timeout /t 3
        5⤵
        Delays execution with timeout.exe
        
        PID:2744
    - - C:\Windows\system32\shutdown.exe
        
        shutdown /r /t 5 /m "Windows Error {Gateway Error: 23}"
        5⤵
        Suspicious use of AdjustPrivilegeToken
        
        PID:268
    - - C:\Windows\system32\NOTEPAD.EXE
        
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\note2.txt
        5⤵
        Opens file in notepad (likely ransom note)
        
        PID:2996

C:\Program Files (x86)\Microsoft Office\Office14\POWERPNT.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\POWERPNT.EXE" /n "C:\Users\Admin\Desktop\StartUninstall.pot"
1⤵
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of WriteProcessMemory
PID:2700
- C:\Windows\splwow64.exe
  C:\Windows\splwow64.exe 12288
  2⤵
  PID:3040

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\7272.tmp\7273.tmp\7274.bat

Filesize
331B

MD5
fb2390ea0912c032c5400d48968999c5

SHA1
096861629584e77c3cc98d1712f82459b0f984e3

SHA256
7898e0ca3640114c202bc3a3a08c93f11c4148279b34cf7860f49443b343b1d2

SHA512
8c2bcc40fd2dc93729c035c0b127fae00cf0ca8120b95d5a9627fb72077210975695564758eba8a22c19cab0b5b596e769c75af793a9852b7c033f57a0e4867c

Download Submit
C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\AutoPlay\autorun.cdd

Filesize
13KB

MD5
f1886a3ccd3af98ac1fb13bd1c7c8a45

SHA1
c9992562f97ad612bee7da6c17fbc9bb8948ab3d

SHA256
109e9510f3a8fe03bd891e356e2b1681d707aea233fa8887197dcf478dbe4238

SHA512
5d605bc569fa7b9c98a3122ebc78cc50ce45e1a2ce13fe3c9b9e555644985d8a9ebc4213fd06d4ae57841d52137b5d495e46c77b70d1f8ea4e88ef1f0407585a

Download Submit
C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\lua5.1.dll

Filesize
322KB

MD5
c3256800dce47c14acc83ccca4c3e2ac

SHA1
9d126818c66991dbc3813a65eddb88bbcf77f30a

SHA256
f26f4f66022acc96d0319c09814ebeda60f4ab96b63b6262045dc786dc7c5866

SHA512
6865a98ad8a6bd02d1ba35a28b36b6306af393f5e9ad767cd6da027bb021f7399d629423f510c44436ac3e4603b6c606493edf8b14d21fabf3eab16d37bd0d25

Download Submit
C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\note.txt

Filesize
28B

MD5
c795d3c9a28e426839d38112fcf2b4d6

SHA1
52c7c7ecd64382041140464b6a0c2d3924fa5dfe

SHA256
9cddde5871aaba593b65754405156454096f80248521e911ea1569e1b0a974d3

SHA512
47ac646d98998cd8af8637f53f795d9a92507a57d423d2e4f041330ddea1f39150975cb42d3df605a65ea29c1579a7710df310791048649c0b460ee21aceac69

Download Submit
C:\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\note2.txt

Filesize
7B

MD5
a8f28f60e832d1a678e19be7e462dc4c

SHA1
fd57c8c97e2271b2ae89416bac29cf50527b21fd

SHA256
0c8a6fb6fe59b6dc0323e9a78c093df5876ffdcb274d5a597fcc022bada61f4e

SHA512
eb48c2e148c7c5cfe2b829f0bbac7d07686cb7e8a05c0ddd553cef1cdec490a7b2599119a8e3630ae1c3997408df609bb0d4fb045e87636c51b1a39d3ebef4cb

Download Submit
\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\AutoPlay\Docs\B.exe

Filesize
89KB

MD5
97bc56c019bcc4128d156327373d568c

SHA1
756666370a57a8b2410b770307b7858baecdaa0e

SHA256
f92cd427afce9e4b1025f1e1a7f094c916abe850e98125b1939458cb7cca608c

SHA512
ddbb143348fd37c8c5377bac491a1bd699a9ac9b1530c7366d748d6670e8b6dacea9afd4f1101438ca68b436af15dbb664e2fa17c414be63d23e0c3b908cd779

Download Submit
\Users\Admin\AppData\Local\Temp\ir_ext_temp_0\autorun.exe

Filesize
6.1MB

MD5
92b320ed576ae9fa5184ddb05b0a42de

SHA1
6bf12f2a683027dcf2132484189e90490ce15825

SHA256
d963ce914724e0fa09a0c0217a6661f8fdb4f59966ab982a8f27321b6cfe0eee

SHA512
51db9dcd0b0a590dc778b927b8e9b2fc1ca40dbb9ebad302be51e86e1f4234b182de7b856fd035a5f6846050d8f6addd552a5a4aea9639f606ea9e768087bde8

Download Submit
memory/2700-29-0x000000002DE21000-0x000000002DE22000-memory.dmp

Filesize
4KB

Download
memory/2700-36-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/2700-37-0x00000000718CD000-0x00000000718D8000-memory.dmp

Filesize
44KB

Download
memory/2700-39-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/2700-40-0x00000000718CD000-0x00000000718D8000-memory.dmp

Filesize
44KB

Download