buer | 44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07

General

Target

44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07.exe
Size

276KB
MD5

f112db5fe30ce25faac045d2eb5b9e14
SHA1

346fa76565cb15beef5306466ad99be143f5a76f
SHA256

44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07
SHA512

81e8b5f313b5ca4e4696ccb33a3381c24e57f2ce6700767c7e81db5579239d096ba24082cd429610eb6c91ad5cc3c4d9a786b6cd2178f0f8c25b1179efe9412f

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

http://koralak.hk/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Buer Loader 6 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4376-131-0x0000000000550000-0x0000000000559000-memory.dmp	buer
behavioral2/memory/4376-132-0x0000000040000000-0x00000000432F3000-memory.dmp	buer
behavioral2/memory/4376-133-0x0000000040000000-0x00000000432F3000-memory.dmp	buer
behavioral2/memory/2356-138-0x0000000040000000-0x00000000432F3000-memory.dmp	buer
behavioral2/memory/4376-140-0x0000000040000000-0x00000000432F3000-memory.dmp	buer
behavioral2/memory/2356-141-0x0000000040000000-0x00000000432F3000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
2356	debugger.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\RailSoftComany = "C:\\Users\\Admin\\AppData\\Roaming\\RailSoft\\debugger.exe"	44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07.exe

Program crash 3 IoCs

pid	pid_target	Process	procid_target
3840	4376	WerFault.exe	82
396	1520	WerFault.exe	94
5052	1520	WerFault.exe	94

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2356	debugger.exe
2356	debugger.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4376 wrote to memory of 2356	4376	44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07.exe	90
PID 4376 wrote to memory of 2356	4376	44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07.exe	90
PID 4376 wrote to memory of 2356	4376	44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07.exe	90
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94
PID 2356 wrote to memory of 1520	2356	debugger.exe	94

C:\Users\Admin\AppData\Local\Temp\44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07.exe
"C:\Users\Admin\AppData\Local\Temp\44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4376
- C:\Users\Admin\AppData\Roaming\RailSoft\debugger.exe
  C:\Users\Admin\AppData\Roaming\RailSoft\debugger.exe "C:\Users\Admin\AppData\Local\Temp\44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07.exe" ensgJJ
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2356
- - C:\Windows\SysWOW64\secinit.exe
    C:\Users\Admin\AppData\Roaming\RailSoft\debugger.exe
    3⤵
    PID:1520
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1520 -s 272
      4⤵
      Program crash
      PID:396
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1520 -s 280
      4⤵
      Program crash
      PID:5052
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4376 -s 440
  2⤵
  - Program crash
  PID:3840

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4376 -ip 4376
1⤵
PID:3656

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 1520 -ip 1520
1⤵
PID:1876

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 1520 -ip 1520
1⤵
PID:1072

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\RailSoft\debugger.exe

Filesize
276KB

MD5
f112db5fe30ce25faac045d2eb5b9e14

SHA1
346fa76565cb15beef5306466ad99be143f5a76f

SHA256
44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07

SHA512
81e8b5f313b5ca4e4696ccb33a3381c24e57f2ce6700767c7e81db5579239d096ba24082cd429610eb6c91ad5cc3c4d9a786b6cd2178f0f8c25b1179efe9412f

Download Submit
C:\Users\Admin\AppData\Roaming\RailSoft\debugger.exe

Filesize
276KB

MD5
f112db5fe30ce25faac045d2eb5b9e14

SHA1
346fa76565cb15beef5306466ad99be143f5a76f

SHA256
44dc7a78801f705233f20d4b37c0e8f72805a86418ba3fe786ec0b14a481cf07

SHA512
81e8b5f313b5ca4e4696ccb33a3381c24e57f2ce6700767c7e81db5579239d096ba24082cd429610eb6c91ad5cc3c4d9a786b6cd2178f0f8c25b1179efe9412f

Download Submit
memory/1520-143-0x0000000000F30000-0x0000000004223000-memory.dmp

Filesize
50.9MB

Download
memory/2356-138-0x0000000040000000-0x00000000432F3000-memory.dmp

Filesize
50.9MB

Download
memory/2356-141-0x0000000040000000-0x00000000432F3000-memory.dmp

Filesize
50.9MB

Download
memory/2356-137-0x000000000044D000-0x0000000000454000-memory.dmp

Filesize
28KB

Download
memory/4376-133-0x0000000040000000-0x00000000432F3000-memory.dmp

Filesize
50.9MB

Download
memory/4376-139-0x000000000057D000-0x0000000000584000-memory.dmp

Filesize
28KB

Download
memory/4376-140-0x0000000040000000-0x00000000432F3000-memory.dmp

Filesize
50.9MB

Download
memory/4376-130-0x000000000057D000-0x0000000000584000-memory.dmp

Filesize
28KB

Download
memory/4376-132-0x0000000040000000-0x00000000432F3000-memory.dmp

Filesize
50.9MB

Download
memory/4376-131-0x0000000000550000-0x0000000000559000-memory.dmp

Filesize
36KB

Download

Analysis

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