tofsee | 23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe

General

Target

23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe
Size

98KB
MD5

e7108d1c5bbdb323e604f85f9293c3bb
SHA1

ed59cb4f3d4ce8e98e638954e610f57d036cbf5e
SHA256

23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe
SHA512

1fd5f4d92e940d2db3003b77668e5cc5227e9c4b43ef2baaf882157876337d47bb964e8eefa37db1d20dd9c712f508e8ab015d73bd7932c8b86a494f1d8f54e9

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7

lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\bxfzsnda = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

yxnjqmr.exe

pid process

1376 yxnjqmr.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1384 netsh.exe

pid	process
1376	yxnjqmr.exe

pid	process
1384	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\bxfzsnda\ImagePath = "C:\\Windows\\SysWOW64\\bxfzsnda\\yxnjqmr.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1612 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

yxnjqmr.exe

description pid process target process

PID 1376 set thread context of 1612 1376 yxnjqmr.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

1280 sc.exe
2028 sc.exe
1816 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1612	svchost.exe

description	pid	process	target process
PID 1376 set thread context of 1612	1376	yxnjqmr.exe	svchost.exe

pid	process
1280	sc.exe
2028	sc.exe
1816	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exeyxnjqmr.exe

description	pid	process	target process
PID 748 wrote to memory of 1340	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 748 wrote to memory of 1340	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 748 wrote to memory of 1340	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 748 wrote to memory of 1340	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 748 wrote to memory of 952	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 748 wrote to memory of 952	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 748 wrote to memory of 952	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 748 wrote to memory of 952	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 748 wrote to memory of 1280	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 1280	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 1280	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 1280	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 2028	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 2028	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 2028	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 2028	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 1816	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 1816	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 1816	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 1816	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 748 wrote to memory of 1384	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	netsh.exe
PID 748 wrote to memory of 1384	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	netsh.exe
PID 748 wrote to memory of 1384	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	netsh.exe
PID 748 wrote to memory of 1384	748	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	netsh.exe
PID 1376 wrote to memory of 1612	1376	yxnjqmr.exe	svchost.exe
PID 1376 wrote to memory of 1612	1376	yxnjqmr.exe	svchost.exe
PID 1376 wrote to memory of 1612	1376	yxnjqmr.exe	svchost.exe
PID 1376 wrote to memory of 1612	1376	yxnjqmr.exe	svchost.exe
PID 1376 wrote to memory of 1612	1376	yxnjqmr.exe	svchost.exe
PID 1376 wrote to memory of 1612	1376	yxnjqmr.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe
"C:\Users\Admin\AppData\Local\Temp\23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:748
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bxfzsnda\
  2⤵
  PID:1340
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yxnjqmr.exe" C:\Windows\SysWOW64\bxfzsnda\
  2⤵
  PID:952
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create bxfzsnda binPath= "C:\Windows\SysWOW64\bxfzsnda\yxnjqmr.exe /d\"C:\Users\Admin\AppData\Local\Temp\23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1280
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description bxfzsnda "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2028
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start bxfzsnda
  2⤵
  - Launches sc.exe
  PID:1816
- 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:1384

C:\Windows\SysWOW64\bxfzsnda\yxnjqmr.exe
C:\Windows\SysWOW64\bxfzsnda\yxnjqmr.exe /d"C:\Users\Admin\AppData\Local\Temp\23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1376
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1612

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

New Service

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Disabling Security Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\yxnjqmr.exe

Filesize
12.4MB

MD5
a424155b5a746c6dde06adc599f43355

SHA1
2fe194c08c07c3623a400c9e1fdeb3bc35cca21e

SHA256
9271fa27f5358ff1f6242e3f10bf483155697f6e6e9d1be5e963db838aa20ba3

SHA512
1f478b10eb46df1a68dd10840350e2d85fcfec24a7c64536564d590ff76b4c88d40081cd1b1355652474272b4d70f3674801acc4aacc0147cba76408f6337b97

Download Submit
C:\Windows\SysWOW64\bxfzsnda\yxnjqmr.exe

Filesize
12.4MB

MD5
a424155b5a746c6dde06adc599f43355

SHA1
2fe194c08c07c3623a400c9e1fdeb3bc35cca21e

SHA256
9271fa27f5358ff1f6242e3f10bf483155697f6e6e9d1be5e963db838aa20ba3

SHA512
1f478b10eb46df1a68dd10840350e2d85fcfec24a7c64536564d590ff76b4c88d40081cd1b1355652474272b4d70f3674801acc4aacc0147cba76408f6337b97

Download Submit
memory/748-54-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/748-55-0x0000000075541000-0x0000000075543000-memory.dmp

Filesize
8KB

Download
memory/952-57-0x0000000000000000-mapping.dmp

Download
memory/1280-59-0x0000000000000000-mapping.dmp

Download
memory/1340-56-0x0000000000000000-mapping.dmp

Download
memory/1376-64-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/1384-62-0x0000000000000000-mapping.dmp

Download
memory/1612-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1612-66-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1612-69-0x0000000000089A6B-mapping.dmp

Download
memory/1612-74-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1612-75-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1816-61-0x0000000000000000-mapping.dmp

Download
memory/2028-60-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads