b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10

General

Target

b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe
Size

87KB
MD5

0d72c28f554c05b37c96da12d5292740
SHA1

fc3d1ef46fb05fc5ef7c2ffe5f30c32a090c08b6
SHA256

b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10
SHA512

7a649afa4259b50f616b5c317511ad35820bfa437e7e6a36a4cf1abc91d86011287c5498a02cbb04afe66d3a077514585f87a30e3b1ae05aa599fb36fd788dd8
SSDEEP

1536:1MIPgEm56wnbkKC2ZyBJU066lwLCRVEB+nR/y8cmNrEIviCOzuajkrDl9HNSjw:11PgEOng1d66jRVa+n4NmNNouukrD7Hn

Score

9^/10

Malware Config

Signatures

Detects executables containing base64 encoded User Agent 5 IoCs

resource	yara_rule
behavioral1/memory/848-14-0x0000000010000000-0x0000000010022000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/848-15-0x0000000010000000-0x0000000010022000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/848-19-0x0000000010000000-0x0000000010022000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/848-20-0x0000000010000000-0x0000000010022000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/848-21-0x0000000010000000-0x0000000010022000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 7 IoCs

resource	yara_rule
behavioral1/memory/2704-11-0x0000000000400000-0x0000000000428000-memory.dmp	UPX
behavioral1/files/0x00350000000149d0-12.dat	UPX
behavioral1/memory/848-14-0x0000000010000000-0x0000000010022000-memory.dmp	UPX
behavioral1/memory/848-15-0x0000000010000000-0x0000000010022000-memory.dmp	UPX
behavioral1/memory/848-19-0x0000000010000000-0x0000000010022000-memory.dmp	UPX
behavioral1/memory/848-20-0x0000000010000000-0x0000000010022000-memory.dmp	UPX
behavioral1/memory/848-21-0x0000000010000000-0x0000000010022000-memory.dmp	UPX

Blocklisted process makes network request 10 IoCs

flow	pid	Process
3	848	rundll32.exe
5	848	rundll32.exe
8	848	rundll32.exe
9	848	rundll32.exe
10	848	rundll32.exe
13	848	rundll32.exe
14	848	rundll32.exe
15	848	rundll32.exe
17	848	rundll32.exe
18	848	rundll32.exe

Deletes itself 1 IoCs

pid	Process
2704	atdkj.exe

Executes dropped EXE 1 IoCs

pid	Process
2704	atdkj.exe

Loads dropped DLL 3 IoCs

pid	Process
1604	cmd.exe
1604	cmd.exe
848	rundll32.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

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x00350000000149d0-12.dat	upx
behavioral1/memory/848-14-0x0000000010000000-0x0000000010022000-memory.dmp	upx
behavioral1/memory/848-15-0x0000000010000000-0x0000000010022000-memory.dmp	upx
behavioral1/memory/848-19-0x0000000010000000-0x0000000010022000-memory.dmp	upx
behavioral1/memory/848-20-0x0000000010000000-0x0000000010022000-memory.dmp	upx
behavioral1/memory/848-21-0x0000000010000000-0x0000000010022000-memory.dmp	upx

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-1-5-21-3691908287-3775019229-3534252667-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\ckckr\\ybffkah.bfy\",crc32"	rundll32.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)	\??\o:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.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	rundll32.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	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
2740	taskkill.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
624	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
848	rundll32.exe
848	rundll32.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	848	rundll32.exe
Token: SeDebugPrivilege	2740	taskkill.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2024	b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe
2704	atdkj.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2024 wrote to memory of 1604	2024	b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe	28
PID 2024 wrote to memory of 1604	2024	b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe	28
PID 2024 wrote to memory of 1604	2024	b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe	28
PID 2024 wrote to memory of 1604	2024	b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe	28
PID 1604 wrote to memory of 624	1604	cmd.exe	30
PID 1604 wrote to memory of 624	1604	cmd.exe	30
PID 1604 wrote to memory of 624	1604	cmd.exe	30
PID 1604 wrote to memory of 624	1604	cmd.exe	30
PID 1604 wrote to memory of 2704	1604	cmd.exe	31
PID 1604 wrote to memory of 2704	1604	cmd.exe	31
PID 1604 wrote to memory of 2704	1604	cmd.exe	31
PID 1604 wrote to memory of 2704	1604	cmd.exe	31
PID 2704 wrote to memory of 848	2704	atdkj.exe	32
PID 2704 wrote to memory of 848	2704	atdkj.exe	32
PID 2704 wrote to memory of 848	2704	atdkj.exe	32
PID 2704 wrote to memory of 848	2704	atdkj.exe	32
PID 2704 wrote to memory of 848	2704	atdkj.exe	32
PID 2704 wrote to memory of 848	2704	atdkj.exe	32
PID 2704 wrote to memory of 848	2704	atdkj.exe	32
PID 848 wrote to memory of 2740	848	rundll32.exe	33
PID 848 wrote to memory of 2740	848	rundll32.exe	33
PID 848 wrote to memory of 2740	848	rundll32.exe	33
PID 848 wrote to memory of 2740	848	rundll32.exe	33

C:\Users\Admin\AppData\Local\Temp\b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe
"C:\Users\Admin\AppData\Local\Temp\b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2024
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\atdkj.exe "C:\Users\Admin\AppData\Local\Temp\b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1604
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:624
- - C:\Users\Admin\AppData\Local\Temp\atdkj.exe
    C:\Users\Admin\AppData\Local\Temp\\atdkj.exe "C:\Users\Admin\AppData\Local\Temp\b65088955b89e7b591e880a357e8d3c0ee5e02458f59f9a920ec9096691eda10.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2704
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\ckckr\ybffkah.bfy",crc32 C:\Users\Admin\AppData\Local\Temp\atdkj.exe
      4⤵
      Blocklisted process makes network request
      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
      Suspicious use of WriteProcessMemory
      PID:848
    - - \??\c:\windows\SysWOW64\taskkill.exe
        
        taskkill /f /im attrib.exe
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2740

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

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Downloads

\??\c:\ckckr\ybffkah.bfy

Filesize
57KB

MD5
2f53f49e01f09d6e6064871eec1955cd

SHA1
a6e1a6e5c2080d0fb2f7a872e3902a8a4a1a9b5f

SHA256
964e4dd2532d540bb61d3c7ccc833f2358d8cd6b2eabc3a2d51183a18b59f82d

SHA512
2cb98030c3df7417c04f796f78f23f96d381871d9c7ae4a14116764e915b2e2f56b9b3a6fb76fedc50a17788de9538fc7954a7b73bf17e4be43e1fc1a06bc218

Download Submit
\Users\Admin\AppData\Local\Temp\atdkj.exe

Filesize
88KB

MD5
fedd6e4cb5f4e65f98266cbb9ca3b55c

SHA1
fad0ea16e7bf677968e33c55ca18d4befaec50a2

SHA256
b0dee187d02b95fef988e8f8405dd6bdd2726e37b3404142dc22da3facbdeefb

SHA512
29c149bfcfac4d4c6d1308e46a4f79401e7752cc2bfc5b676e081a653455022807702ab7c6b44ca20a7869e65e99afc5a2d6f2aa8b16edabeb092ee615abd15a

Download Submit
memory/848-15-0x0000000010000000-0x0000000010022000-memory.dmp

Filesize
136KB

Download
memory/848-14-0x0000000010000000-0x0000000010022000-memory.dmp

Filesize
136KB

Download
memory/848-19-0x0000000010000000-0x0000000010022000-memory.dmp

Filesize
136KB

Download
memory/848-20-0x0000000010000000-0x0000000010022000-memory.dmp

Filesize
136KB

Download
memory/848-21-0x0000000010000000-0x0000000010022000-memory.dmp

Filesize
136KB

Download
memory/1604-6-0x0000000000500000-0x0000000000528000-memory.dmp

Filesize
160KB

Download
memory/2024-3-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/2024-1-0x00000000002E0000-0x00000000002E1000-memory.dmp

Filesize
4KB

Download
memory/2024-0-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/2704-9-0x00000000001F0000-0x00000000001F1000-memory.dmp

Filesize
4KB

Download
memory/2704-11-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads