fakeav | 6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51

Analysis

max time kernel
91s
max time network
128s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
01-12-2022 07:46

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General

Target

6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe
Size

755KB
MD5

87b6c78a8c50ed939a060244184c0c85
SHA1

cf6b4f8e6c1171592a1f532de622d6f821b628b5
SHA256

6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51
SHA512

6329bd6879e273044c9165c8441e4d3f20a9fb8a5f1978e79e1934e35e54c1bbe474e247e45f65ba675f6331d8608b528aad221ab60a1821e8029b13192ee238
SSDEEP

12288:xoxejOONAM7GUC1Jr+4o628gx2Jw+tP3Jzm8JOmGXCJdw/oX+pd167QhEQO:2xY3NtGUmJr+4Obxd+tPZSZX/oE6EhE

Score

10^/10

fakeav fakeav persistence spyware upx

Malware Config

Signatures

FakeAV, RogueAntivirus
FakeAV or Rogue AntiVirus is a class of malware that displays false alert messages.
fakeav spyware fakeav

Executes dropped EXE 1 IoCs

pid	Process
1256	KeyGen.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0002000000022e25-134.dat	upx
behavioral2/files/0x0002000000022e25-133.dat	upx
behavioral2/memory/1256-135-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1256-136-0x0000000000400000-0x000000000041F000-memory.dmp	upx

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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CSRLT.EXE = "C:\\Windows\\system32\\CSRLT.EXE"	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\MSBLT.EXE = "C:\\Windows\\MSBLT.EXE"	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\CSRLT.EXE	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe
File opened for modification	C:\Windows\SysWOW64\CSRLT.EXE	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\MSBLT.EXE	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe
File created	C:\Windows\KeyGen.exe	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe
File created	C:\Windows\MSBLT.EXE	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe

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

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1256	KeyGen.exe
1256	KeyGen.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4896 wrote to memory of 1256	4896	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe	81
PID 4896 wrote to memory of 1256	4896	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe	81
PID 4896 wrote to memory of 1256	4896	6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe	81

C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe
"C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4896
- C:\Windows\KeyGen.exe
  "C:\Windows\KeyGen.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:1256

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\KeyGen.exe

Filesize
52KB

MD5
e3c7d489013b51c671aa79c9068a2a00

SHA1
deed13e52afcc9fd2ef326fb6b0aa4bf7fcf14be

SHA256
5ea232ac5ebca4584f8689d5a1ed466404272a5c5496f41934537504368b5da2

SHA512
18a31ffcc796d6352142374dc0e12d83b9b46d56069a5db26a38b0f6a133302f13d7064bfe9bc16e7a705aeeb2cec2d654863d92280a6085c8202a3c8096b240

Download Submit
C:\Windows\KeyGen.exe

Filesize
52KB

MD5
e3c7d489013b51c671aa79c9068a2a00

SHA1
deed13e52afcc9fd2ef326fb6b0aa4bf7fcf14be

SHA256
5ea232ac5ebca4584f8689d5a1ed466404272a5c5496f41934537504368b5da2

SHA512
18a31ffcc796d6352142374dc0e12d83b9b46d56069a5db26a38b0f6a133302f13d7064bfe9bc16e7a705aeeb2cec2d654863d92280a6085c8202a3c8096b240

Download Submit
memory/1256-135-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1256-136-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download