15cf59f51f4db331ebf27dbedd9dd1338fd181db4706f5d4a4f1d5d557f0ee61

Analysis

max time kernel
150s
max time network
118s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
05/03/2024, 15:15

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General

Target

b5038e4dd7e93055c95d32d4a6dc24d3.exe
Size

12KB
MD5

b5038e4dd7e93055c95d32d4a6dc24d3
SHA1

bd73590351b719ee76408c9ba45e94d51007a572
SHA256

15cf59f51f4db331ebf27dbedd9dd1338fd181db4706f5d4a4f1d5d557f0ee61
SHA512

eabd0aaf8b1d727610b2f1cd40f310e89a35102ad67b22392fac2e45867bcb014978feb79c54aa59201f8ed391d84a1287d60634a12dee59bfabd6e147d0f44a
SSDEEP

192:3eK+RH3ErhTxWOZGzDbhtd/KZEsvwnZKnG8FPedmqMlmSIYgV3RAtUu+9yoDSP4b:OK+F3EdTxZuD/d/7svyZonFPmONIYgDr

Score

8^/10

persistence upx

Malware Config

Signatures

Modifies AppInit DLL entries 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1547.001

Modify Registry
T1112

Deletes itself 1 IoCs

pid	Process
2724	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
2912	rexljehk.exe

Loads dropped DLL 2 IoCs

pid	Process
2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe
2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2100-0-0x0000000000400000-0x0000000000410000-memory.dmp	upx
behavioral1/files/0x000b000000013413-3.dat	upx
behavioral1/memory/2912-11-0x0000000000400000-0x0000000000410000-memory.dmp	upx
behavioral1/memory/2100-12-0x0000000000400000-0x0000000000410000-memory.dmp	upx

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\rexljeh.dll	b5038e4dd7e93055c95d32d4a6dc24d3.exe
File created	C:\Windows\SysWOW64\rexljehk.exe	b5038e4dd7e93055c95d32d4a6dc24d3.exe
File opened for modification	C:\Windows\SysWOW64\rexljehk.exe	b5038e4dd7e93055c95d32d4a6dc24d3.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2100 wrote to memory of 2912	2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe	28
PID 2100 wrote to memory of 2912	2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe	28
PID 2100 wrote to memory of 2912	2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe	28
PID 2100 wrote to memory of 2912	2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe	28
PID 2100 wrote to memory of 2724	2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe	29
PID 2100 wrote to memory of 2724	2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe	29
PID 2100 wrote to memory of 2724	2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe	29
PID 2100 wrote to memory of 2724	2100	b5038e4dd7e93055c95d32d4a6dc24d3.exe	29

C:\Users\Admin\AppData\Local\Temp\b5038e4dd7e93055c95d32d4a6dc24d3.exe
"C:\Users\Admin\AppData\Local\Temp\b5038e4dd7e93055c95d32d4a6dc24d3.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:2100
- C:\Windows\SysWOW64\rexljehk.exe
  C:\Windows\system32\rexljehk.exe ˜‰
  2⤵
  - Executes dropped EXE
  PID:2912
- C:\Windows\SysWOW64\cmd.exe
  cmd /c C:\Users\Admin\AppData\Local\Temp\b5038e4dd7e93055c95d32d4a6dc24d3.exe.bat
  2⤵
  - Deletes itself
  PID:2724

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\b5038e4dd7e93055c95d32d4a6dc24d3.exe.bat

Filesize
182B

MD5
4976157c91b8f2a456384310deb68760

SHA1
9ae88dd034fcfd814a697974200398ce38b03533

SHA256
e56004e8bac1487131931b72a4432bf319b4e42eb3551dcbe2ce95fe6d3125fe

SHA512
dacc16f6551201c7e6f46961fb33525b53cbf74a3bea1380af2b056676ed0eab9b6d76358f9bacd2711904046519af577ac4a40315f1f1da4ce8bbf290c4b28b

Download Submit
\Windows\SysWOW64\rexljehk.exe

Filesize
12KB

MD5
b5038e4dd7e93055c95d32d4a6dc24d3

SHA1
bd73590351b719ee76408c9ba45e94d51007a572

SHA256
15cf59f51f4db331ebf27dbedd9dd1338fd181db4706f5d4a4f1d5d557f0ee61

SHA512
eabd0aaf8b1d727610b2f1cd40f310e89a35102ad67b22392fac2e45867bcb014978feb79c54aa59201f8ed391d84a1287d60634a12dee59bfabd6e147d0f44a

Download Submit
memory/2100-0-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2100-10-0x0000000000230000-0x0000000000240000-memory.dmp

Filesize
64KB

Download
memory/2100-12-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2100-16-0x0000000000230000-0x0000000000240000-memory.dmp

Filesize
64KB

Download
memory/2912-11-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download