tofsee | 46c879741fc6d476d4ff3edcd1b33c43c5b6107958925d706dd83fb0b1035f20

General

Target

f1bdc796ba64b96cd4aaaf20ff3da0cc.exe
Size

13.1MB
MD5

f1bdc796ba64b96cd4aaaf20ff3da0cc
SHA1

3853853e87d469821b136c75f4bc16b09a9c5a2b
SHA256

46c879741fc6d476d4ff3edcd1b33c43c5b6107958925d706dd83fb0b1035f20
SHA512

e6876df269d2c0559484e37b0da780191c45ae3a6b3d48b7dc01002e5a789e696a6fe7b9674e60d90e94bd5214a7ebb2012a3bd39bf381bc79d40aa33b5bf92a
SSDEEP

24576:Vl3YWRibbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbn:

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
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
316	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\htrofery\ImagePath = "C:\\Windows\\SysWOW64\\htrofery\\ehrxepiy.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-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe

Deletes itself 1 IoCs

pid	Process
5100	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4888	ehrxepiy.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4888 set thread context of 5100	4888	ehrxepiy.exe	107

Launches sc.exe 3 IoCs

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

pid	Process
1556	sc.exe
4580	sc.exe
4480	sc.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 528 wrote to memory of 2608	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	94
PID 528 wrote to memory of 2608	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	94
PID 528 wrote to memory of 2608	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	94
PID 528 wrote to memory of 4424	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	97
PID 528 wrote to memory of 4424	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	97
PID 528 wrote to memory of 4424	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	97
PID 528 wrote to memory of 1556	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	99
PID 528 wrote to memory of 1556	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	99
PID 528 wrote to memory of 1556	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	99
PID 528 wrote to memory of 4580	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	101
PID 528 wrote to memory of 4580	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	101
PID 528 wrote to memory of 4580	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	101
PID 528 wrote to memory of 4480	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	103
PID 528 wrote to memory of 4480	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	103
PID 528 wrote to memory of 4480	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	103
PID 528 wrote to memory of 316	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	106
PID 528 wrote to memory of 316	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	106
PID 528 wrote to memory of 316	528	f1bdc796ba64b96cd4aaaf20ff3da0cc.exe	106
PID 4888 wrote to memory of 5100	4888	ehrxepiy.exe	107
PID 4888 wrote to memory of 5100	4888	ehrxepiy.exe	107
PID 4888 wrote to memory of 5100	4888	ehrxepiy.exe	107
PID 4888 wrote to memory of 5100	4888	ehrxepiy.exe	107
PID 4888 wrote to memory of 5100	4888	ehrxepiy.exe	107

C:\Users\Admin\AppData\Local\Temp\f1bdc796ba64b96cd4aaaf20ff3da0cc.exe
"C:\Users\Admin\AppData\Local\Temp\f1bdc796ba64b96cd4aaaf20ff3da0cc.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:528
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\htrofery\
  2⤵
  PID:2608
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ehrxepiy.exe" C:\Windows\SysWOW64\htrofery\
  2⤵
  PID:4424
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create htrofery binPath= "C:\Windows\SysWOW64\htrofery\ehrxepiy.exe /d\"C:\Users\Admin\AppData\Local\Temp\f1bdc796ba64b96cd4aaaf20ff3da0cc.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1556
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description htrofery "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4580
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start htrofery
  2⤵
  - Launches sc.exe
  PID:4480
- 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:316

C:\Windows\SysWOW64\htrofery\ehrxepiy.exe
C:\Windows\SysWOW64\htrofery\ehrxepiy.exe /d"C:\Users\Admin\AppData\Local\Temp\f1bdc796ba64b96cd4aaaf20ff3da0cc.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4888
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:5100

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
1.3MB

MD5
2cf38946970ecb0f4ec259d6cbaf7d3d

SHA1
a8e7d43a52968a3c70768a07bbfb60eaa0f4d888

SHA256
bc491513179fb643e3863b439c9ee1efd742afce6be742aa215be119e7ae8e23

SHA512
d68c4f66b56ffa576808c5f77f94ca5e18636cec252fe8a4465d2342a9ae780a3d379e232398a8cecae9a6a0531071a7490d40693f6502b612344ba19a90c9bc

Download Submit
C:\Windows\SysWOW64\htrofery\ehrxepiy.exe

Filesize
99KB

MD5
07506671ae860c321526f3b43f8f44a3

SHA1
d9467b184f45cfb99f9b91829f9f4b1f4156f98e

SHA256
99c362704a185960aad4a01b42276c746f441bb490e18d36ea8ae0bc24dc83c6

SHA512
48023648ba17fa87c00f724d9b22541d839fdf4d6897ac8455ddccb1c855ad97f10af74aec248dfeb091c2152affc43f6826a10aa6c95d319ba33fc7837c3d6a

Download Submit
memory/528-2-0x00000000005E0000-0x00000000005E1000-memory.dmp

Filesize
4KB

Download
memory/528-1-0x00000000005D0000-0x00000000005D1000-memory.dmp

Filesize
4KB

Download
memory/528-0-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/528-6-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/4888-9-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/4888-7-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/5100-13-0x0000000000A60000-0x0000000000A75000-memory.dmp

Filesize
84KB

Download
memory/5100-14-0x0000000000A60000-0x0000000000A75000-memory.dmp

Filesize
84KB

Download
memory/5100-8-0x0000000000A60000-0x0000000000A75000-memory.dmp

Filesize
84KB

Download
memory/5100-15-0x0000000000A60000-0x0000000000A75000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads