bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2

General

Target

bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2.exe
Size

203KB
MD5

fa5fc1f9b853099bf670d3639c762731
SHA1

4a1512f1ca81227893b120413783eb9003d6d2f1
SHA256

bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2
SHA512

c75c07d08c8903d00966e733e67abf8f64a6f29746e663ec50fcd1dd941315c990ac74927ecb6b666dd60c772c0fb0927056df46c3db05ec291d1b99a282e3b6
SSDEEP

3072:fP5gvNVLIfHQja1RfmLQADwSKkhU+tLgT5lODbiC8r1PkT:X2vnSwjaOcADw9cUeCOf

Score

7^/10

Malware Config

Signatures

Deletes itself 1 IoCs

pid	Process
3896	eucfe.exe

Executes dropped EXE 2 IoCs

pid	Process
3896	eucfe.exe
1696	yyemyr.exe

Loads dropped DLL 1 IoCs

pid	Process
1696	yyemyr.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1815711207-1844170477-3539718864-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Depend = "c:\\Program Files\\wledyborx\\yyemyr.exe \"c:\\Program Files\\wledyborx\\yyemyr.dll\",Compliance"	yyemyr.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\j:	yyemyr.exe
File opened (read-only)	\??\k:	yyemyr.exe
File opened (read-only)	\??\m:	yyemyr.exe
File opened (read-only)	\??\v:	yyemyr.exe
File opened (read-only)	\??\z:	yyemyr.exe
File opened (read-only)	\??\g:	yyemyr.exe
File opened (read-only)	\??\i:	yyemyr.exe
File opened (read-only)	\??\s:	yyemyr.exe
File opened (read-only)	\??\t:	yyemyr.exe
File opened (read-only)	\??\b:	yyemyr.exe
File opened (read-only)	\??\q:	yyemyr.exe
File opened (read-only)	\??\o:	yyemyr.exe
File opened (read-only)	\??\p:	yyemyr.exe
File opened (read-only)	\??\r:	yyemyr.exe
File opened (read-only)	\??\u:	yyemyr.exe
File opened (read-only)	\??\x:	yyemyr.exe
File opened (read-only)	\??\h:	yyemyr.exe
File opened (read-only)	\??\n:	yyemyr.exe
File opened (read-only)	\??\l:	yyemyr.exe
File opened (read-only)	\??\w:	yyemyr.exe
File opened (read-only)	\??\y:	yyemyr.exe
File opened (read-only)	\??\a:	yyemyr.exe
File opened (read-only)	\??\e:	yyemyr.exe

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

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

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	yyemyr.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\wledyborx	eucfe.exe
File created	\??\c:\Program Files\wledyborx\yyemyr.dll	eucfe.exe
File created	\??\c:\Program Files\wledyborx\yyemyr.exe	eucfe.exe
File opened for modification	\??\c:\Program Files\wledyborx\yyemyr.exe	eucfe.exe

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	yyemyr.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	yyemyr.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2944	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1696	yyemyr.exe
1696	yyemyr.exe
1696	yyemyr.exe
1696	yyemyr.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1696	yyemyr.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2296	bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2.exe
3896	eucfe.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2296 wrote to memory of 3812	2296	bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2.exe	84
PID 2296 wrote to memory of 3812	2296	bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2.exe	84
PID 2296 wrote to memory of 3812	2296	bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2.exe	84
PID 3812 wrote to memory of 2944	3812	cmd.exe	86
PID 3812 wrote to memory of 2944	3812	cmd.exe	86
PID 3812 wrote to memory of 2944	3812	cmd.exe	86
PID 3812 wrote to memory of 3896	3812	cmd.exe	87
PID 3812 wrote to memory of 3896	3812	cmd.exe	87
PID 3812 wrote to memory of 3896	3812	cmd.exe	87
PID 3896 wrote to memory of 1696	3896	eucfe.exe	88
PID 3896 wrote to memory of 1696	3896	eucfe.exe	88
PID 3896 wrote to memory of 1696	3896	eucfe.exe	88

C:\Users\Admin\AppData\Local\Temp\bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2.exe
"C:\Users\Admin\AppData\Local\Temp\bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2296
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\eucfe.exe "C:\Users\Admin\AppData\Local\Temp\bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3812
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:2944
- - C:\Users\Admin\AppData\Local\Temp\eucfe.exe
    C:\Users\Admin\AppData\Local\Temp\\eucfe.exe "C:\Users\Admin\AppData\Local\Temp\bf00cfe3b07876d3a25800986a3e3ae4a1a86204aee88780dae40634ef004dd2.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3896
  - - \??\c:\Program Files\wledyborx\yyemyr.exe
      "c:\Program Files\wledyborx\yyemyr.exe" "c:\Program Files\wledyborx\yyemyr.dll",Compliance C:\Users\Admin\AppData\Local\Temp\eucfe.exe
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1696

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

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
204KB

MD5
8d40433f8c83f7741178087a96aa4e32

SHA1
e218a63a58acb64854cd2e0329609a15212fca4e

SHA256
6f469ce3732d6cffeb4561e47f61614a4921b940c1831a214c52775a7e8dc4da

SHA512
553965f577fa9878924b3ad77d7505eadb8c698765733cac89f61212615400003bc13a74db5c555ca7c17fe8d1d6a803aed2f0b4b8e71f20a9d5ea59087530b5

Download Submit
\??\c:\Program Files\wledyborx\yyemyr.dll

Filesize
141KB

MD5
505ad7927e3c7ce6324f22fac6a70590

SHA1
e9c0492f537181f7c92eaf8f894d61ff040dc610

SHA256
2e2d12fe7477bb2b57e8245decd96ce55a375957b7fe5ba405790842a1c6e798

SHA512
ad4eb36a2f9528e08bd372fb939c60e6c760ea2102d927a5b688a25d1f0acb70bee633ceb26c09a9ca8c924f0d65c5c5f1ce50655429b073606e020800debedb

Download Submit
\??\c:\Program Files\wledyborx\yyemyr.exe

Filesize
60KB

MD5
889b99c52a60dd49227c5e485a016679

SHA1
8fa889e456aa646a4d0a4349977430ce5fa5e2d7

SHA256
6cbe0e1f046b13b29bfa26f8b368281d2dda7eb9b718651d5856f22cc3e02910

SHA512
08933106eaf338dd119c45cbf1f83e723aff77cc0f8d3fc84e36253b1eb31557a54211d1d5d1cb58958188e32064d451f6c66a24b3963cccd3de07299ab90641

Download Submit
memory/1696-28-0x0000000010000000-0x000000001004E000-memory.dmp

Filesize
312KB

Download
memory/1696-21-0x0000000010000000-0x000000001004E000-memory.dmp

Filesize
312KB

Download
memory/1696-19-0x0000000010000000-0x000000001004E000-memory.dmp

Filesize
312KB

Download
memory/1696-18-0x0000000010000000-0x000000001004E000-memory.dmp

Filesize
312KB

Download
memory/2296-4-0x0000000000400000-0x000000000044901D-memory.dmp

Filesize
292KB

Download
memory/2296-0-0x0000000000400000-0x000000000044901D-memory.dmp

Filesize
292KB

Download
memory/2296-2-0x0000000000400000-0x000000000044901D-memory.dmp

Filesize
292KB

Download
memory/2296-1-0x0000000000400000-0x000000000044901D-memory.dmp

Filesize
292KB

Download
memory/3896-13-0x0000000000400000-0x000000000044901D-memory.dmp

Filesize
292KB

Download
memory/3896-9-0x0000000000400000-0x000000000044901D-memory.dmp

Filesize
292KB

Download
memory/3896-8-0x0000000000400000-0x000000000044901D-memory.dmp

Filesize
292KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads