buer | 4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d

General

Target

b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
Size

693KB
MD5

b61b330f0ad589422d862cebf65e92c1
SHA1

54d7cb2745607e2ea52db8423cf9f210c7674ee6
SHA256

4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d
SHA512

534bc27db1c8df0ff2c7e5aaf4dc6a4aaffde931e3dacb2490b219c3a0323362afdec5d65d18d6c1ba44cbd384a1020319ff3298ab1330cab459b8b198d46dc1
SSDEEP

6144:/mLwKpYnJEmpdSiWRWUJsT9IFinLwObXRPSPh8Ad9hPp5GtSkAOCnEIqnO9ykYHz:/SOEoWRGxnDx89haYRTnCO9oaEJ

Score

10^/10

buer execution loader

Malware Config

Extracted

Family

buer

C2

https://bankcreditsign.com/

Signatures

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

Buer Loader 2 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/2240-0-0x00000000004C0000-0x0000000000520000-memory.dmp	buer
behavioral1/memory/2240-4-0x0000000040000000-0x000000004005D000-memory.dmp	buer

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2588	powershell.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)	\??\E:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\I:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\N:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\T:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\W:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\A:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\G:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\H:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\X:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\S:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\B:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\K:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\M:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\O:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\P:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\Q:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\R:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\V:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\Y:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\J:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\L:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\U:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\Z:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2588	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2588	powershell.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2240 wrote to memory of 2588	2240	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe	28
PID 2240 wrote to memory of 2588	2240	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe	28
PID 2240 wrote to memory of 2588	2240	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe	28
PID 2240 wrote to memory of 2588	2240	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe	28

C:\Users\Admin\AppData\Local\Temp\b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe"
1⤵
- Enumerates connected drives
- Suspicious use of WriteProcessMemory
PID:2240
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\dd6e57eb44b3c8375160}"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2588

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2240-0-0x00000000004C0000-0x0000000000520000-memory.dmp

Filesize
384KB

Download
memory/2240-7-0x0000000000400000-0x00000000004BF000-memory.dmp

Filesize
764KB

Download
memory/2240-4-0x0000000040000000-0x000000004005D000-memory.dmp

Filesize
372KB

Download
memory/2588-10-0x00000000736B1000-0x00000000736B2000-memory.dmp

Filesize
4KB

Download
memory/2588-11-0x00000000736B0000-0x0000000073C5B000-memory.dmp

Filesize
5.7MB

Download
memory/2588-12-0x00000000736B0000-0x0000000073C5B000-memory.dmp

Filesize
5.7MB

Download
memory/2588-13-0x00000000736B0000-0x0000000073C5B000-memory.dmp

Filesize
5.7MB

Download

Analysis

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