isrstealer | ec10f4e43d71e5d52862f7d11af464316b4301254f62fedfba385a097923ffa4

General

Target

4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe
Size

696KB
MD5

4ece9e1e721cd7dc5a270b3cf7d1f083
SHA1

a863b9cb0531deee7e356f2534a39723b5ee929b
SHA256

ec10f4e43d71e5d52862f7d11af464316b4301254f62fedfba385a097923ffa4
SHA512

8560755a71bb652cad90839b85d5f6f8d63984b1e5e8a887ec55d38a206451fb6c639aafd6cc4f904b776081b9c940800c3100125dbfcdd65c7e1fda4d3c14be
SSDEEP

12288:3m1+jgi2aZFMZj7Kexe2f27HjUtbnbKEFsB61a9tNMbFynKNJDzGGpZJD:yxqZaZjWy2Utbusd1a9tObFynKHGG1

Score

10^/10

isrstealer bootkit persistence stealer trojan

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 2 IoCs

resource	yara_rule
behavioral1/memory/2700-35-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2700-32-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
2096	chronic-16-12.exe
588	SnDk&p.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	SnDk&p.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
588	SnDk&p.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2096 set thread context of 2700	2096	chronic-16-12.exe	32

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 3 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.key\	SnDk&p.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.key\ = "regfile"	SnDk&p.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.key	SnDk&p.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
588	SnDk&p.exe
588	SnDk&p.exe
2700	svchost.exe
2700	svchost.exe
2700	svchost.exe
2700	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2700	svchost.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2556 wrote to memory of 2096	2556	4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe	30
PID 2556 wrote to memory of 2096	2556	4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe	30
PID 2556 wrote to memory of 2096	2556	4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe	30
PID 2556 wrote to memory of 2096	2556	4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe	30
PID 2556 wrote to memory of 588	2556	4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe	31
PID 2556 wrote to memory of 588	2556	4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe	31
PID 2556 wrote to memory of 588	2556	4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe	31
PID 2556 wrote to memory of 588	2556	4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe	31
PID 2096 wrote to memory of 2700	2096	chronic-16-12.exe	32
PID 2096 wrote to memory of 2700	2096	chronic-16-12.exe	32
PID 2096 wrote to memory of 2700	2096	chronic-16-12.exe	32
PID 2096 wrote to memory of 2700	2096	chronic-16-12.exe	32
PID 2096 wrote to memory of 2700	2096	chronic-16-12.exe	32
PID 2096 wrote to memory of 2700	2096	chronic-16-12.exe	32
PID 2096 wrote to memory of 2700	2096	chronic-16-12.exe	32
PID 2096 wrote to memory of 2700	2096	chronic-16-12.exe	32

C:\Users\Admin\AppData\Local\Temp\4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\4ece9e1e721cd7dc5a270b3cf7d1f083_JaffaCakes118.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2556
- C:\Users\Admin\AppData\Local\Temp\chronic-16-12.exe
  "C:\Users\Admin\AppData\Local\Temp\chronic-16-12.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:2096
- - C:\Windows\SysWOW64\svchost.exe
    "C:\Windows\system32\svchost.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:2700
- C:\Users\Admin\AppData\Local\Temp\SnDk&p.exe
  "C:\Users\Admin\AppData\Local\Temp\SnDk&p.exe"
  2⤵
  - Executes dropped EXE
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  PID:588

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\SnDk&p.exe

Filesize
282KB

MD5
3e9b7b76b154342811a8dcc2b507c1ce

SHA1
2828b9bd9e3d65e578b51b049a2bf5d4f2aef182

SHA256
16ff4927174e13d3bfa6da64956c8fb50a6087fba07b26234d0a4bfcdbaff729

SHA512
b6aa6f304d5976ab4b9330fcff39c3c04e38c900500d020a3bb5eb7dc86036fe5b0c4d5acbf838d1d8a0bbcffe384e44379bb552182fa15a5420641bc1738090

Download Submit
C:\Users\Admin\AppData\Local\Temp\chronic-16-12.exe

Filesize
224KB

MD5
e9448b0e4b0460577192295bde8324c1

SHA1
647bf34d64c913f41f74c13b431159f956eaa032

SHA256
f567a106a362584f89d672f36fe1651edd166f03e579c6d682e2ff222e73baa8

SHA512
5fdc74cdbc3c32a4ce5159ed234e4104eb15ecb2d8fdbb3968d58cbc2a9b378c920e6d40940f3eca231df236d142c8890553b2b43093eec4b36506f8d485a6c5

Download Submit
memory/588-44-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-25-0x0000000001F40000-0x0000000001F41000-memory.dmp

Filesize
4KB

Download
memory/588-26-0x0000000001FB0000-0x0000000001FB1000-memory.dmp

Filesize
4KB

Download
memory/588-53-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-24-0x0000000001F50000-0x0000000001F51000-memory.dmp

Filesize
4KB

Download
memory/588-51-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-50-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-21-0x0000000001F20000-0x0000000001F21000-memory.dmp

Filesize
4KB

Download
memory/588-20-0x0000000001F30000-0x0000000001F31000-memory.dmp

Filesize
4KB

Download
memory/588-19-0x00000000022F0000-0x00000000022F1000-memory.dmp

Filesize
4KB

Download
memory/588-18-0x0000000001D80000-0x0000000001D81000-memory.dmp

Filesize
4KB

Download
memory/588-17-0x0000000001ED0000-0x0000000001ED1000-memory.dmp

Filesize
4KB

Download
memory/588-49-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-15-0x0000000001FA0000-0x0000000001FA1000-memory.dmp

Filesize
4KB

Download
memory/588-48-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-47-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-52-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-27-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-46-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-45-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-39-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-40-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-41-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-42-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/588-43-0x0000000000400000-0x00000000004C1000-memory.dmp

Filesize
772KB

Download
memory/2096-23-0x0000000074592000-0x0000000074594000-memory.dmp

Filesize
8KB

Download
memory/2096-16-0x0000000074591000-0x0000000074592000-memory.dmp

Filesize
4KB

Download
memory/2096-22-0x0000000000B00000-0x0000000000B40000-memory.dmp

Filesize
256KB

Download
memory/2556-0-0x000007FEF62DE000-0x000007FEF62DF000-memory.dmp

Filesize
4KB

Download
memory/2556-14-0x000007FEF6020000-0x000007FEF69BD000-memory.dmp

Filesize
9.6MB

Download
memory/2700-28-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2700-35-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2700-30-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2700-34-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2700-32-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads