tofsee | 1da02515700ea587c82946f00859c0b40812fe9c063144a4e06711764fea00c0

Analysis

max time kernel
149s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
29/12/2023, 18:34

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General

Target
00989dd92c1d87b9652f1264888f8e9f.exe
Size 11.2MB
Sample231229-w71z6abcfp
SHA256 1da02515700ea587c82946f00859c0b40812fe9c063144a4e06711764fea00c0
MD5 00989dd92c1d87b9652f1264888f8e9f
SHA1 8554adcde5266de2e6002df066c0134626535eee
SHA512 be7e344c311a1f7e4cad8fedfb2b8ef79f75a2c89b09ef685f4d4014cd2629e982eeed8af514a769d0acbd9d81b2a7f49264107bcc2fae1ded8c0a07c7101e3e
SSDEEP 3072:DdIKxNiT/X910MzPvrmJXOWYL1DyHSHbfTYBDsopr7p85KzqyROF5LevXZUmoBZH:DdIKziTP910Uwq1uH4gBDs8BgRn2x
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

defeatwax.ru
refabyd.info

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
2856	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\zkhhxrkw\ImagePath = "C:\\Windows\\SysWOW64\\zkhhxrkw\\tcouezvl.exe"	svchost.exe

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-1-5-21-983843758-932321429-1636175382-1000\Control Panel\International\Geo\Nation	00989dd92c1d87b9652f1264888f8e9f.exe

Deletes itself 1 IoCs

pid	Process
3376	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3984	tcouezvl.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3984 set thread context of 3376	3984	tcouezvl.exe	114

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
3080	sc.exe
1896	sc.exe
2232	sc.exe

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
2196	4364	WerFault.exe	87
1968	3984	WerFault.exe	105

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4364 wrote to memory of 3016	4364	00989dd92c1d87b9652f1264888f8e9f.exe	91
PID 4364 wrote to memory of 3016	4364	00989dd92c1d87b9652f1264888f8e9f.exe	91
PID 4364 wrote to memory of 3016	4364	00989dd92c1d87b9652f1264888f8e9f.exe	91
PID 4364 wrote to memory of 3008	4364	00989dd92c1d87b9652f1264888f8e9f.exe	96
PID 4364 wrote to memory of 3008	4364	00989dd92c1d87b9652f1264888f8e9f.exe	96
PID 4364 wrote to memory of 3008	4364	00989dd92c1d87b9652f1264888f8e9f.exe	96
PID 4364 wrote to memory of 3080	4364	00989dd92c1d87b9652f1264888f8e9f.exe	98
PID 4364 wrote to memory of 3080	4364	00989dd92c1d87b9652f1264888f8e9f.exe	98
PID 4364 wrote to memory of 3080	4364	00989dd92c1d87b9652f1264888f8e9f.exe	98
PID 4364 wrote to memory of 1896	4364	00989dd92c1d87b9652f1264888f8e9f.exe	102
PID 4364 wrote to memory of 1896	4364	00989dd92c1d87b9652f1264888f8e9f.exe	102
PID 4364 wrote to memory of 1896	4364	00989dd92c1d87b9652f1264888f8e9f.exe	102
PID 4364 wrote to memory of 2232	4364	00989dd92c1d87b9652f1264888f8e9f.exe	104
PID 4364 wrote to memory of 2232	4364	00989dd92c1d87b9652f1264888f8e9f.exe	104
PID 4364 wrote to memory of 2232	4364	00989dd92c1d87b9652f1264888f8e9f.exe	104
PID 4364 wrote to memory of 2856	4364	00989dd92c1d87b9652f1264888f8e9f.exe	108
PID 4364 wrote to memory of 2856	4364	00989dd92c1d87b9652f1264888f8e9f.exe	108
PID 4364 wrote to memory of 2856	4364	00989dd92c1d87b9652f1264888f8e9f.exe	108
PID 3984 wrote to memory of 3376	3984	tcouezvl.exe	114
PID 3984 wrote to memory of 3376	3984	tcouezvl.exe	114
PID 3984 wrote to memory of 3376	3984	tcouezvl.exe	114
PID 3984 wrote to memory of 3376	3984	tcouezvl.exe	114
PID 3984 wrote to memory of 3376	3984	tcouezvl.exe	114

C:\Users\Admin\AppData\Local\Temp\00989dd92c1d87b9652f1264888f8e9f.exe
"C:\Users\Admin\AppData\Local\Temp\00989dd92c1d87b9652f1264888f8e9f.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4364
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zkhhxrkw\
  2⤵
  PID:3016
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tcouezvl.exe" C:\Windows\SysWOW64\zkhhxrkw\
  2⤵
  PID:3008
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zkhhxrkw binPath= "C:\Windows\SysWOW64\zkhhxrkw\tcouezvl.exe /d\"C:\Users\Admin\AppData\Local\Temp\00989dd92c1d87b9652f1264888f8e9f.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3080
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zkhhxrkw "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1896
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zkhhxrkw
  2⤵
  - Launches sc.exe
  PID:2232
- C:\Windows\SysWOW64\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
  2⤵
  - Modifies Windows Firewall
  PID:2856
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4364 -s 1140
  2⤵
  - Program crash
  PID:2196

C:\Windows\SysWOW64\zkhhxrkw\tcouezvl.exe
C:\Windows\SysWOW64\zkhhxrkw\tcouezvl.exe /d"C:\Users\Admin\AppData\Local\Temp\00989dd92c1d87b9652f1264888f8e9f.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3984
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3984 -s 556
  2⤵
  - Program crash
  PID:1968
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:3376

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4364 -ip 4364
1⤵
PID:2772

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 3984 -ip 3984
1⤵
PID:5004

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tcouezvl.exe

Path C:\Users\Admin\AppData\Local\Temp\tcouezvl.exe
Size 5.1MB
SHA256 629d470c9213d45027c80f11fd88dca6b4c9161c7724f07e895943418ddb2e00
MD5 ec7502efe616e03aef1d139e570460b2
SHA1 bb3006383eba8f0d9d6d296207c7daa3a79c8057
SHA512 804d1ad283d8bfb7b844bd830f248954777e6e8aadf1e405d6ef6450977bf2c2eefdff13b6f508847642e68793f85396de51a161db03e5d7c633875425b78c70
SSDEEP 3072:D2IKxNiT/X910MzPvrmJXOWYL1DyHSHbfTYBDsopr7p85KzqyROF5LevXZUmoBZH:D2IKziTP910Uwq1uH4gBDs8BgRn2x
MD5 SHA1 SHA512 SSDEEP

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tcouezvl.exe

Path C:\Windows\SysWOW64\zkhhxrkw\tcouezvl.exe
Size 4.7MB
SHA256 209ebb3f5f67527e6e7a67fdc0ffcffca2597504e35931a621fa2027379ab787
MD5 b28eea5ebba5d966829712829b8e4fc8
SHA1 e293dcbe3da82c9c0911f34dd57b3ecc01f007a9
SHA512 32b362bbd2691d17043d5ec6f0b8b3ebf6dd89dc10ce260f498252bb6f0418e5ea455dbf2c9dd64d4c4a1e88e36d03f42e0b95407aa821ce07453e4a04512058
SSDEEP 3072:D2IKxNiT/X910MzPvrmJXOWYL1DyHSHbfTYBDsopr7p85KzqyROF5LevXZUmoBZH:D2IKziTP910Uwq1uH4gBDs8BgRn2x
MD5 SHA1 SHA512 SSDEEP

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memory/3376-18-0x00000000008E0000-0x00000000008F5000-memory.dmp

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memory/3376-16-0x00000000008E0000-0x00000000008F5000-memory.dmp

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memory/3376-15-0x00000000008E0000-0x00000000008F5000-memory.dmp

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memory/3376-12-0x00000000008E0000-0x00000000008F5000-memory.dmp

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memory/3376-19-0x00000000008E0000-0x00000000008F5000-memory.dmp

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memory/3984-10-0x0000000000600000-0x0000000000700000-memory.dmp

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memory/3984-17-0x0000000000400000-0x0000000000456000-memory.dmp

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memory/3984-11-0x0000000000400000-0x0000000000456000-memory.dmp

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memory/4364-3-0x0000000000400000-0x0000000000456000-memory.dmp

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memory/4364-2-0x00000000021A0000-0x00000000021B3000-memory.dmp

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memory/4364-9-0x00000000021A0000-0x00000000021B3000-memory.dmp

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memory/4364-8-0x0000000000400000-0x0000000000456000-memory.dmp

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memory/4364-1-0x0000000000480000-0x0000000000580000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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