gozi_ifsb | 46dc49be65d7165e2a6009854a4f27f0088230199e61e0555cb1bd266535874a

Analysis

max time kernel
134s
max time network
157s
platform
windows10_x64
resource
win10v200722
submitted
11-08-2020 12:30

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General

Target

foo/b6e7c9793cf40153bf8865195e06ecbc.exe

Score

10^/10

gozi_ifsb banker bootkit evasion persistence trojan

Malware Config

Signatures

Gozi, Gozi IFSB
Gozi ISFB is a well-known and widely distributed banking trojan.
banker trojan gozi_ifsb
Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Executes dropped EXE 1 IoCs

pid	Process
892	Client.exe

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	b6e7c9793cf40153bf8865195e06ecbc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	b6e7c9793cf40153bf8865195e06ecbc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Client.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Client.exe

Identifies Wine through registry keys 2 TTPs 2 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Wine	b6e7c9793cf40153bf8865195e06ecbc.exe
Key opened	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Wine	Client.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	b6e7c9793cf40153bf8865195e06ecbc.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Client.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	ip-api.com

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1067

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	b6e7c9793cf40153bf8865195e06ecbc.exe
File opened for modification	\??\PhysicalDrive0	Client.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3940	b6e7c9793cf40153bf8865195e06ecbc.exe
892	Client.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Subzero\Client.exe	Client.exe
File opened for modification	C:\Program Files (x86)\Subzero	Client.exe
File created	C:\Program Files (x86)\Subzero\Client.exe	b6e7c9793cf40153bf8865195e06ecbc.exe
File opened for modification	C:\Program Files (x86)\Subzero\Client.exe	b6e7c9793cf40153bf8865195e06ecbc.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
580	schtasks.exe
1948	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3940	b6e7c9793cf40153bf8865195e06ecbc.exe
3940	b6e7c9793cf40153bf8865195e06ecbc.exe
892	Client.exe
892	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3940	b6e7c9793cf40153bf8865195e06ecbc.exe
Token: SeDebugPrivilege	892	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
892	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3940 wrote to memory of 580	3940	b6e7c9793cf40153bf8865195e06ecbc.exe	67
PID 3940 wrote to memory of 580	3940	b6e7c9793cf40153bf8865195e06ecbc.exe	67
PID 3940 wrote to memory of 580	3940	b6e7c9793cf40153bf8865195e06ecbc.exe	67
PID 3940 wrote to memory of 892	3940	b6e7c9793cf40153bf8865195e06ecbc.exe	69
PID 3940 wrote to memory of 892	3940	b6e7c9793cf40153bf8865195e06ecbc.exe	69
PID 3940 wrote to memory of 892	3940	b6e7c9793cf40153bf8865195e06ecbc.exe	69
PID 892 wrote to memory of 1948	892	Client.exe	70
PID 892 wrote to memory of 1948	892	Client.exe	70
PID 892 wrote to memory of 1948	892	Client.exe	70

C:\Users\Admin\AppData\Local\Temp\foo\b6e7c9793cf40153bf8865195e06ecbc.exe
"C:\Users\Admin\AppData\Local\Temp\foo\b6e7c9793cf40153bf8865195e06ecbc.exe"
1⤵
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Checks whether UAC is enabled
- Writes to the Master Boot Record (MBR)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3940
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "MailRuHelp" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\foo\b6e7c9793cf40153bf8865195e06ecbc.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:580
- C:\Program Files (x86)\Subzero\Client.exe
  "C:\Program Files (x86)\Subzero\Client.exe"
  2⤵
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Identifies Wine through registry keys
  - Checks whether UAC is enabled
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Drops file in Program Files directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:892
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "MailRuHelp" /sc ONLOGON /tr "C:\Program Files (x86)\Subzero\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1948

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Bootkit

T1067

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/892-16-0x00000000733C0000-0x0000000073AAE000-memory.dmp

Filesize
6.9MB

Download
memory/892-13-0x0000000004BB0000-0x0000000004BB1000-memory.dmp

Filesize
4KB

Download
memory/892-26-0x00000000089B0000-0x00000000089B1000-memory.dmp

Filesize
4KB

Download
memory/892-17-0x0000000001090000-0x0000000001091000-memory.dmp

Filesize
4KB

Download
memory/892-14-0x00000000053B0000-0x00000000053B1000-memory.dmp

Filesize
4KB

Download
memory/3940-3-0x0000000001160000-0x0000000001161000-memory.dmp

Filesize
4KB

Download
memory/3940-6-0x0000000007A70000-0x0000000007A71000-memory.dmp

Filesize
4KB

Download
memory/3940-5-0x0000000008040000-0x0000000008041000-memory.dmp

Filesize
4KB

Download
memory/3940-2-0x00000000733C0000-0x0000000073AAE000-memory.dmp

Filesize
6.9MB

Download
memory/3940-0-0x0000000005360000-0x0000000005361000-memory.dmp

Filesize
4KB

Download
memory/3940-9-0x0000000008B30000-0x0000000008B31000-memory.dmp

Filesize
4KB

Download
memory/3940-8-0x0000000008760000-0x0000000008761000-memory.dmp

Filesize
4KB

Download
memory/3940-1-0x0000000005B60000-0x0000000005B61000-memory.dmp

Filesize
4KB

Download
memory/3940-7-0x0000000007C40000-0x0000000007C41000-memory.dmp

Filesize
4KB

Download