8e9f08d7cb18c753ef43ea7f55aa5180b7748bf0f72ff45a57c518effe32dad2

Analysis

max time kernel
148s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
07/06/2024, 09:24

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General

Target
2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe
Size 6.7MB
Sample240607-lc2m4aeb3t
SHA256 8e9f08d7cb18c753ef43ea7f55aa5180b7748bf0f72ff45a57c518effe32dad2
MD5 08c685f4dfdf901cd64b35a006a62c3a
SHA1 41e2a3c206cdc0aa6307c79efcd3ef12d6064df7
SHA512 c0b441f914fe302324815d74ef4bb6bc808f7c8db2374f7ae931cad9940b18d4803f2a97fb40246065014b74878709aa8e266f980823fa89f0b3a55e87f5ce28
SSDEEP 196608:YHCP1MwM9513s7KJjkWSPr+2GA/wQaWU6l9rpB:YQ1C1smmWi+2GACWHl9rP
MD5 SHA1 SHA512 SSDEEP

Score

9^/10

execution upx

Malware Config

Signatures

UPX dump on OEP (original entry point) 3 IoCs

resource	yara_rule
behavioral2/files/0x0006000000022fa8-1.dat	UPX
behavioral2/memory/4804-4-0x0000000010000000-0x0000000010030000-memory.dmp	UPX
behavioral2/memory/4804-31-0x0000000010000000-0x0000000010030000-memory.dmp	UPX

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
1972	powershell.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x0006000000022fa8-1.dat	acprotect

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3571316656-3665257725-2415531812-1000\Control Panel\International\Geo\Nation	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe

Loads dropped DLL 1 IoCs

pid	Process
4804	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0006000000022fa8-1.dat	upx
behavioral2/memory/4804-4-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/memory/4804-31-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Enumerates connected drives 3 TTPs 1 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\e:	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe
File created	\??\c:\program files\common files\system\symsrv.dll.000	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4804	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe
4804	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe
1972	powershell.exe
1972	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4804	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe
Token: SeDebugPrivilege	1972	powershell.exe

Suspicious use of WriteProcessMemory 51 IoCs

description	pid	Process	procid_target
PID 4804 wrote to memory of 1316	4804	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe	87
PID 4804 wrote to memory of 1316	4804	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe	87
PID 4804 wrote to memory of 1316	4804	2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe	87
PID 1316 wrote to memory of 1796	1316	cmd.exe	89
PID 1316 wrote to memory of 1796	1316	cmd.exe	89
PID 1316 wrote to memory of 1796	1316	cmd.exe	89
PID 1796 wrote to memory of 2152	1796	forfiles.exe	91
PID 1796 wrote to memory of 2152	1796	forfiles.exe	91
PID 1796 wrote to memory of 2152	1796	forfiles.exe	91
PID 2152 wrote to memory of 3592	2152	cmd.exe	92
PID 2152 wrote to memory of 3592	2152	cmd.exe	92
PID 2152 wrote to memory of 3592	2152	cmd.exe	92
PID 1316 wrote to memory of 1896	1316	cmd.exe	93
PID 1316 wrote to memory of 1896	1316	cmd.exe	93
PID 1316 wrote to memory of 1896	1316	cmd.exe	93
PID 1896 wrote to memory of 5104	1896	forfiles.exe	94
PID 1896 wrote to memory of 5104	1896	forfiles.exe	94
PID 1896 wrote to memory of 5104	1896	forfiles.exe	94
PID 5104 wrote to memory of 760	5104	cmd.exe	95
PID 5104 wrote to memory of 760	5104	cmd.exe	95
PID 5104 wrote to memory of 760	5104	cmd.exe	95
PID 1316 wrote to memory of 4060	1316	cmd.exe	97
PID 1316 wrote to memory of 4060	1316	cmd.exe	97
PID 1316 wrote to memory of 4060	1316	cmd.exe	97
PID 4060 wrote to memory of 3204	4060	forfiles.exe	98
PID 4060 wrote to memory of 3204	4060	forfiles.exe	98
PID 4060 wrote to memory of 3204	4060	forfiles.exe	98
PID 3204 wrote to memory of 1816	3204	cmd.exe	99
PID 3204 wrote to memory of 1816	3204	cmd.exe	99
PID 3204 wrote to memory of 1816	3204	cmd.exe	99
PID 1316 wrote to memory of 2320	1316	cmd.exe	100
PID 1316 wrote to memory of 2320	1316	cmd.exe	100
PID 1316 wrote to memory of 2320	1316	cmd.exe	100
PID 2320 wrote to memory of 2932	2320	forfiles.exe	101
PID 2320 wrote to memory of 2932	2320	forfiles.exe	101
PID 2320 wrote to memory of 2932	2320	forfiles.exe	101
PID 2932 wrote to memory of 3316	2932	cmd.exe	102
PID 2932 wrote to memory of 3316	2932	cmd.exe	102
PID 2932 wrote to memory of 3316	2932	cmd.exe	102
PID 1316 wrote to memory of 4456	1316	cmd.exe	103
PID 1316 wrote to memory of 4456	1316	cmd.exe	103
PID 1316 wrote to memory of 4456	1316	cmd.exe	103
PID 4456 wrote to memory of 4948	4456	forfiles.exe	104
PID 4456 wrote to memory of 4948	4456	forfiles.exe	104
PID 4456 wrote to memory of 4948	4456	forfiles.exe	104
PID 4948 wrote to memory of 1972	4948	cmd.exe	105
PID 4948 wrote to memory of 1972	4948	cmd.exe	105
PID 4948 wrote to memory of 1972	4948	cmd.exe	105
PID 1972 wrote to memory of 3192	1972	powershell.exe	106
PID 1972 wrote to memory of 3192	1972	powershell.exe	106
PID 1972 wrote to memory of 3192	1972	powershell.exe	106

C:\Users\Admin\AppData\Local\Temp\2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe
"C:\Users\Admin\AppData\Local\Temp\2024-06-07_08c685f4dfdf901cd64b35a006a62c3a_bkransomware_floxif.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Enumerates connected drives
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4804
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C forfiles /p c:\windows\system32 /m waitfor.exe /c "cmd /C reg add \"HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction\" /f /v 2147735503 /t REG_SZ /d 6" & forfiles /p c:\windows\system32 /m waitfor.exe /c "cmd /C reg add \"HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction\" /f /v 2147814524 /t REG_SZ /d 6" & forfiles /p c:\windows\system32 /m cmd.exe /c "cmd /C reg add \"HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction\" /f /v 2147780199 /t REG_SZ /d 6" & forfiles /p c:\windows\system32 /m calc.exe /c "cmd /C reg add \"HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction\" /f /v 2147812831 /t REG_SZ /d 6" & forfiles /p c:\windows\system32 /m ping.exe /c "cmd /C powershell start-process -WindowStyle Hidden gpupdate.exe /force"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1316
- - C:\Windows\SysWOW64\forfiles.exe
    forfiles /p c:\windows\system32 /m waitfor.exe /c "cmd /C reg add \"HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction\" /f /v 2147735503 /t REG_SZ /d 6"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1796
  - - C:\Windows\SysWOW64\cmd.exe
      /C reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction" /f /v 2147735503 /t REG_SZ /d 6
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2152
    - - \??\c:\windows\SysWOW64\reg.exe
        
        reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction" /f /v 2147735503 /t REG_SZ /d 6
        5⤵
        
        PID:3592
- - C:\Windows\SysWOW64\forfiles.exe
    forfiles /p c:\windows\system32 /m waitfor.exe /c "cmd /C reg add \"HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction\" /f /v 2147814524 /t REG_SZ /d 6"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1896
  - - C:\Windows\SysWOW64\cmd.exe
      /C reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction" /f /v 2147814524 /t REG_SZ /d 6
      4⤵
      Suspicious use of WriteProcessMemory
      PID:5104
    - - \??\c:\windows\SysWOW64\reg.exe
        
        reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction" /f /v 2147814524 /t REG_SZ /d 6
        5⤵
        
        PID:760
- - C:\Windows\SysWOW64\forfiles.exe
    forfiles /p c:\windows\system32 /m cmd.exe /c "cmd /C reg add \"HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction\" /f /v 2147780199 /t REG_SZ /d 6"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4060
  - - C:\Windows\SysWOW64\cmd.exe
      /C reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction" /f /v 2147780199 /t REG_SZ /d 6
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3204
    - - \??\c:\windows\SysWOW64\reg.exe
        
        reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction" /f /v 2147780199 /t REG_SZ /d 6
        5⤵
        
        PID:1816
- - C:\Windows\SysWOW64\forfiles.exe
    forfiles /p c:\windows\system32 /m calc.exe /c "cmd /C reg add \"HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction\" /f /v 2147812831 /t REG_SZ /d 6"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2320
  - - C:\Windows\SysWOW64\cmd.exe
      /C reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction" /f /v 2147812831 /t REG_SZ /d 6
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2932
    - - \??\c:\windows\SysWOW64\reg.exe
        
        reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatIDDefaultAction" /f /v 2147812831 /t REG_SZ /d 6
        5⤵
        
        PID:3316
- - C:\Windows\SysWOW64\forfiles.exe
    forfiles /p c:\windows\system32 /m ping.exe /c "cmd /C powershell start-process -WindowStyle Hidden gpupdate.exe /force"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4456
  - - C:\Windows\SysWOW64\cmd.exe
      /C powershell start-process -WindowStyle Hidden gpupdate.exe /force
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4948
    - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        powershell start-process -WindowStyle Hidden gpupdate.exe /force
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1972
      - C:\Windows\SysWOW64\gpupdate.exe
        
        "C:\Windows\system32\gpupdate.exe" /force
        6⤵
        
        PID:3192

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

symsrv.dll

Path C:\Program Files\Common Files\System\symsrv.dll
Size 67KB
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab
SSDEEP 1536:YjV8y93KQpFQmPLRk7G50zy/riF12jvRyo0hQk7ZL:c8y93KQjy7G55riF1cMo03V
MD5 SHA1 SHA512 SSDEEP

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__PSScriptPolicyTest_cru1kzs3.3ls.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_cru1kzs3.3ls.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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memory/1972-13-0x0000000005310000-0x0000000005938000-memory.dmp

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memory/1972-26-0x0000000005C50000-0x0000000005FA4000-memory.dmp

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memory/1972-36-0x00000000079D0000-0x0000000007F74000-memory.dmp

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memory/1972-14-0x00000000052A0000-0x00000000052C2000-memory.dmp

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memory/1972-15-0x0000000005B70000-0x0000000005BD6000-memory.dmp

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memory/1972-16-0x0000000005BE0000-0x0000000005C46000-memory.dmp

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memory/1972-34-0x0000000006730000-0x000000000674A000-memory.dmp

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memory/1972-12-0x0000000002950000-0x0000000002986000-memory.dmp

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memory/1972-27-0x0000000006210000-0x000000000622E000-memory.dmp

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memory/1972-28-0x0000000006250000-0x000000000629C000-memory.dmp

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memory/1972-35-0x0000000006780000-0x00000000067A2000-memory.dmp

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memory/1972-33-0x00000000067D0000-0x0000000006866000-memory.dmp

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memory/4804-32-0x00000000002D0000-0x000000000097E000-memory.dmp

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memory/4804-31-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/4804-4-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/4804-6-0x00000000002D1000-0x00000000002D2000-memory.dmp

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