ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d

Analysis

max time kernel
152s
max time network
34s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
23/11/2022, 23:37

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General

Target

ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
Size

453KB
MD5

4b65e158f455b199d9840c9360806330
SHA1

c990396de5beab412159de930a04c10c102d9dde
SHA256

ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d
SHA512

fd645a2176936e73ff28497c75d41d37cc2cf68cd1bb1f07c2f404054ec0b56bf535f25fc672ed158f9fbeebcb7a70610bd5e163476b12ad534f6237b9626012
SSDEEP

12288:E6/DdQHroPTAwpwXQsBPTeoG0HhDtdC2Cp4JSErXDSrX:T7WsPkA8QsBPyoG0HBrC2zJSKDSb

Score

10^/10

persistence upx

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe C:\\Windows\\system32\\fservice.exe"	services.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe C:\\Windows\\system32\\fservice.exe"	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe

Adds policy Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\DirectX For Microsoft® Windows = "C:\\Windows\\system32\\fservice.exe"	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	services.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\DirectX For Microsoft® Windows = "C:\\Windows\\system32\\fservice.exe"	services.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe

Executes dropped EXE 2 IoCs

pid	Process
1468	fservice.exe
1636	services.exe

Modifies Installed Components in the registry 2 TTPs 5 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5Y99AE78-58TT-11dW-BE53-Y67078979Y}\StubPath = "C:\\Windows\\system\\sservice.exe"	services.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5Y99AE78-58TT-11dW-BE53-Y67078979Y}	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5Y99AE78-58TT-11dW-BE53-Y67078979Y}\	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5Y99AE78-58TT-11dW-BE53-Y67078979Y}\StubPath = "C:\\Windows\\system\\sservice.exe"	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5Y99AE78-58TT-11dW-BE53-Y67078979Y}\	services.exe

UPX packed file 14 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/files/0x000b0000000122f0-55.dat	upx
behavioral1/memory/1552-56-0x0000000000400000-0x00000000005FF000-memory.dmp	upx
behavioral1/memory/1552-57-0x0000000003050000-0x000000000324F000-memory.dmp	upx
behavioral1/files/0x000b0000000122f0-58.dat	upx
behavioral1/files/0x000b0000000122f0-60.dat	upx
behavioral1/files/0x000b0000000122f0-62.dat	upx
behavioral1/files/0x000a0000000122f3-63.dat	upx
behavioral1/files/0x00080000000122f8-65.dat	upx
behavioral1/memory/1468-69-0x0000000000400000-0x00000000005FF000-memory.dmp	upx
behavioral1/memory/1636-71-0x0000000000400000-0x00000000005FF000-memory.dmp	upx
behavioral1/memory/1636-74-0x0000000000400000-0x00000000005FF000-memory.dmp	upx
behavioral1/memory/1468-75-0x0000000000400000-0x00000000005FF000-memory.dmp	upx
behavioral1/memory/1552-79-0x0000000000400000-0x00000000005FF000-memory.dmp	upx
behavioral1/files/0x00080000000122f8-78.dat	upx

Deletes itself 1 IoCs

pid	Process
296	cmd.exe

Loads dropped DLL 4 IoCs

pid	Process
1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
1636	services.exe
1636	services.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	services.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\winkey.dll	services.exe
File created	C:\Windows\SysWOW64\reginv.dll	services.exe
File created	C:\Windows\SysWOW64\fservice.exe	services.exe
File created	C:\Windows\SysWOW64\fservice.exe	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
File opened for modification	C:\Windows\SysWOW64\fservice.exe	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
File created	C:\Windows\SysWOW64\fservice.exe	fservice.exe
File opened for modification	C:\Windows\SysWOW64\fservice.exe	fservice.exe

Drops file in Windows directory 8 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system\sservice.exe	fservice.exe
File created	C:\Windows\system\sservice.exe	services.exe
File opened for modification	C:\Windows\system\sservice.exe	services.exe
File created	C:\Windows\system\sservice.exe	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
File opened for modification	C:\Windows\system\sservice.exe	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
File created	C:\Windows\services.exe	fservice.exe
File opened for modification	C:\Windows\services.exe	fservice.exe
File created	C:\Windows\system\sservice.exe	fservice.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 47 IoCs

pid	Process
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe
1636	services.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1636	services.exe
1636	services.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 1552 wrote to memory of 1468	1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe	28
PID 1552 wrote to memory of 1468	1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe	28
PID 1552 wrote to memory of 1468	1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe	28
PID 1552 wrote to memory of 1468	1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe	28
PID 1468 wrote to memory of 1636	1468	fservice.exe	29
PID 1468 wrote to memory of 1636	1468	fservice.exe	29
PID 1468 wrote to memory of 1636	1468	fservice.exe	29
PID 1468 wrote to memory of 1636	1468	fservice.exe	29
PID 1636 wrote to memory of 868	1636	services.exe	30
PID 1636 wrote to memory of 868	1636	services.exe	30
PID 1636 wrote to memory of 868	1636	services.exe	30
PID 1636 wrote to memory of 868	1636	services.exe	30
PID 1636 wrote to memory of 1324	1636	services.exe	31
PID 1636 wrote to memory of 1324	1636	services.exe	31
PID 1636 wrote to memory of 1324	1636	services.exe	31
PID 1636 wrote to memory of 1324	1636	services.exe	31
PID 1552 wrote to memory of 296	1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe	34
PID 1552 wrote to memory of 296	1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe	34
PID 1552 wrote to memory of 296	1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe	34
PID 1552 wrote to memory of 296	1552	ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe	34
PID 868 wrote to memory of 1624	868	NET.exe	36
PID 868 wrote to memory of 1624	868	NET.exe	36
PID 868 wrote to memory of 1624	868	NET.exe	36
PID 868 wrote to memory of 1624	868	NET.exe	36
PID 1324 wrote to memory of 1292	1324	NET.exe	37
PID 1324 wrote to memory of 1292	1324	NET.exe	37
PID 1324 wrote to memory of 1292	1324	NET.exe	37
PID 1324 wrote to memory of 1292	1324	NET.exe	37

C:\Users\Admin\AppData\Local\Temp\ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe
"C:\Users\Admin\AppData\Local\Temp\ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe"
1⤵
- Modifies WinLogon for persistence
- Adds policy Run key to start application
- Modifies Installed Components in the registry
- Loads dropped DLL
- Modifies WinLogon
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:1552
- C:\Windows\SysWOW64\fservice.exe
  C:\Windows\system32\fservice.exe
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Drops file in Windows directory
  - Suspicious use of WriteProcessMemory
  PID:1468
- - C:\Windows\services.exe
    C:\Windows\services.exe -XP
    3⤵
    - Modifies WinLogon for persistence
    - Adds policy Run key to start application
    - Executes dropped EXE
    - Modifies Installed Components in the registry
    - Loads dropped DLL
    - Modifies WinLogon
    - Drops file in System32 directory
    - Drops file in Windows directory
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1636
  - - C:\Windows\SysWOW64\NET.exe
      NET STOP srservice
      4⤵
      Suspicious use of WriteProcessMemory
      PID:868
    - - C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 STOP srservice
        5⤵
        
        PID:1624
  - - C:\Windows\SysWOW64\NET.exe
      NET STOP navapsvc
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1324
    - - C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 STOP navapsvc
        5⤵
        
        PID:1292
- C:\Windows\SysWOW64\cmd.exe
  cmd /c C:\Users\Admin\AppData\Local\Temp\ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe.bat
  2⤵
  - Deletes itself
  PID:296

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d.exe.bat

Filesize
133B

MD5
9dcdf4ba701da37cc372d95accd62a80

SHA1
f5831f526d1d98a81b1beca864978891af3154e3

SHA256
fa62a7724000763512fccc71de962d231439606ec3b13ff848dac6cfd854e2b8

SHA512
b8c92b6ad97e0696a53f2de25127efac7f27b30cafae2404cd4539c0211c72d4ffa77fbb7405e8a87c19f3206618a4c96c76ee15134ab09ce8bcd6e38a35d000

Download Submit
C:\Windows\SysWOW64\fservice.exe

Filesize
453KB

MD5
4b65e158f455b199d9840c9360806330

SHA1
c990396de5beab412159de930a04c10c102d9dde

SHA256
ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d

SHA512
fd645a2176936e73ff28497c75d41d37cc2cf68cd1bb1f07c2f404054ec0b56bf535f25fc672ed158f9fbeebcb7a70610bd5e163476b12ad534f6237b9626012

Download Submit
C:\Windows\SysWOW64\fservice.exe

Filesize
453KB

MD5
4b65e158f455b199d9840c9360806330

SHA1
c990396de5beab412159de930a04c10c102d9dde

SHA256
ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d

SHA512
fd645a2176936e73ff28497c75d41d37cc2cf68cd1bb1f07c2f404054ec0b56bf535f25fc672ed158f9fbeebcb7a70610bd5e163476b12ad534f6237b9626012

Download Submit
C:\Windows\services.exe

Filesize
453KB

MD5
4b65e158f455b199d9840c9360806330

SHA1
c990396de5beab412159de930a04c10c102d9dde

SHA256
ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d

SHA512
fd645a2176936e73ff28497c75d41d37cc2cf68cd1bb1f07c2f404054ec0b56bf535f25fc672ed158f9fbeebcb7a70610bd5e163476b12ad534f6237b9626012

Download Submit
C:\Windows\services.exe

Filesize
453KB

MD5
4b65e158f455b199d9840c9360806330

SHA1
c990396de5beab412159de930a04c10c102d9dde

SHA256
ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d

SHA512
fd645a2176936e73ff28497c75d41d37cc2cf68cd1bb1f07c2f404054ec0b56bf535f25fc672ed158f9fbeebcb7a70610bd5e163476b12ad534f6237b9626012

Download Submit
C:\Windows\system\sservice.exe

Filesize
453KB

MD5
4b65e158f455b199d9840c9360806330

SHA1
c990396de5beab412159de930a04c10c102d9dde

SHA256
ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d

SHA512
fd645a2176936e73ff28497c75d41d37cc2cf68cd1bb1f07c2f404054ec0b56bf535f25fc672ed158f9fbeebcb7a70610bd5e163476b12ad534f6237b9626012

Download Submit
\Windows\SysWOW64\fservice.exe

Filesize
453KB

MD5
4b65e158f455b199d9840c9360806330

SHA1
c990396de5beab412159de930a04c10c102d9dde

SHA256
ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d

SHA512
fd645a2176936e73ff28497c75d41d37cc2cf68cd1bb1f07c2f404054ec0b56bf535f25fc672ed158f9fbeebcb7a70610bd5e163476b12ad534f6237b9626012

Download Submit
\Windows\SysWOW64\fservice.exe

Filesize
453KB

MD5
4b65e158f455b199d9840c9360806330

SHA1
c990396de5beab412159de930a04c10c102d9dde

SHA256
ac31ec788a1cb0b45a2390101236d28cf2820d7decc7d8c5078ee3f6cb7ccd4d

SHA512
fd645a2176936e73ff28497c75d41d37cc2cf68cd1bb1f07c2f404054ec0b56bf535f25fc672ed158f9fbeebcb7a70610bd5e163476b12ad534f6237b9626012

Download Submit
\Windows\SysWOW64\reginv.dll

Filesize
36KB

MD5
d4a3f90e159ffbcbc4f9740de4b7f171

SHA1
0542f5d1e2c23dca8d90766b3a8537dc3880e5c9

SHA256
2200dd5f83d2fb8c5d3994206a4fa9ff34b4cbfe56ed39a9a03c954cf45d8f77

SHA512
5493beb50b5f7d8ec52f32718d01696916ae173456005d0c1294ce695161ce5004aff58ee3892bf5db0f9b23720146a6d3ae8ffbcbbd81f84d894fdc8cf75a94

Download Submit
\Windows\SysWOW64\winkey.dll

Filesize
24KB

MD5
43e7d9b875c921ba6be38d45540fb9dd

SHA1
f22a73fc0d4aa3ea6c0b8f61d974b028f308acc4

SHA256
f1b2b0abe844e6ba812c7f8709a463a7f6c56fa6ac38d376a0739cc3469f795b

SHA512
2e74e23c0875b69b82319391c392132f28f4eb45aa412805130382498ae48969a06a2b3a7528b626fa7d7ddb6b006f19f0ef8d73cf73cb9a0c0df44a21077622

Download Submit
memory/1468-75-0x0000000000400000-0x00000000005FF000-memory.dmp

Filesize
2.0MB

Download
memory/1468-69-0x0000000000400000-0x00000000005FF000-memory.dmp

Filesize
2.0MB

Download
memory/1468-70-0x0000000002ED0000-0x00000000030CF000-memory.dmp

Filesize
2.0MB

Download
memory/1552-68-0x0000000003050000-0x000000000324F000-memory.dmp

Filesize
2.0MB

Download
memory/1552-79-0x0000000000400000-0x00000000005FF000-memory.dmp

Filesize
2.0MB

Download
memory/1552-54-0x0000000075C81000-0x0000000075C83000-memory.dmp

Filesize
8KB

Download
memory/1552-57-0x0000000003050000-0x000000000324F000-memory.dmp

Filesize
2.0MB

Download
memory/1552-56-0x0000000000400000-0x00000000005FF000-memory.dmp

Filesize
2.0MB

Download
memory/1636-74-0x0000000000400000-0x00000000005FF000-memory.dmp

Filesize
2.0MB

Download
memory/1636-71-0x0000000000400000-0x00000000005FF000-memory.dmp

Filesize
2.0MB

Download