isrstealer | 33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803

General

Target

33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe
Size

1010KB
MD5

5a0ea1ccb0cddd973b3a35e70f7a5b17
SHA1

6cbfef80043a991b73f62747450085ec30cd267f
SHA256

33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803
SHA512

f2c4c1904685ef7b10d0996ff3a3b1efacfe16fe7ac2e0a960fbb69041b57358ec19c9d01fcd6f6537b06e77a218e948bb023598f91939bb8ffbce6520a29e65
SSDEEP

24576:Y9ctReZNtnbkiWk9d8PSqiHa1YfMQvV7PnZY2n+c:1EZTYHkPkSfH4yMSRY2

Score

10^/10

isrstealer collection stealer trojan upx

Malware Config

Signatures

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

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/2764-136-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2764-141-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2764-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2764-156-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1520-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1520-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/1520-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1520-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2920-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2920-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2920-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2920-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1520-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1520-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1520-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1520-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1128 set thread context of 2764	1128	33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe	84
PID 2764 set thread context of 2920	2764	vbc.exe	85
PID 2764 set thread context of 1520	2764	vbc.exe	86

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1128	33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2764	vbc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1128 wrote to memory of 2764	1128	33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe	84
PID 1128 wrote to memory of 2764	1128	33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe	84
PID 1128 wrote to memory of 2764	1128	33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe	84
PID 1128 wrote to memory of 2764	1128	33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe	84
PID 1128 wrote to memory of 2764	1128	33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe	84
PID 1128 wrote to memory of 2764	1128	33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe	84
PID 1128 wrote to memory of 2764	1128	33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe	84
PID 2764 wrote to memory of 2920	2764	vbc.exe	85
PID 2764 wrote to memory of 2920	2764	vbc.exe	85
PID 2764 wrote to memory of 2920	2764	vbc.exe	85
PID 2764 wrote to memory of 2920	2764	vbc.exe	85
PID 2764 wrote to memory of 2920	2764	vbc.exe	85
PID 2764 wrote to memory of 2920	2764	vbc.exe	85
PID 2764 wrote to memory of 2920	2764	vbc.exe	85
PID 2764 wrote to memory of 2920	2764	vbc.exe	85
PID 2764 wrote to memory of 1520	2764	vbc.exe	86
PID 2764 wrote to memory of 1520	2764	vbc.exe	86
PID 2764 wrote to memory of 1520	2764	vbc.exe	86
PID 2764 wrote to memory of 1520	2764	vbc.exe	86
PID 2764 wrote to memory of 1520	2764	vbc.exe	86
PID 2764 wrote to memory of 1520	2764	vbc.exe	86
PID 2764 wrote to memory of 1520	2764	vbc.exe	86
PID 2764 wrote to memory of 1520	2764	vbc.exe	86

C:\Users\Admin\AppData\Local\Temp\33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe
"C:\Users\Admin\AppData\Local\Temp\33f3c90640f81afc2210d3936ed94545817a1c5d87fb55e03d485bb760882803.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1128
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2764
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\y6Gchynp1U.ini"
    3⤵
    PID:2920
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\9ZV5K64Ct2.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1520

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\y6Gchynp1U.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1128-140-0x0000000074E10000-0x00000000753C1000-memory.dmp

Filesize
5.7MB

Download
memory/1128-133-0x0000000074E10000-0x00000000753C1000-memory.dmp

Filesize
5.7MB

Download
memory/1128-134-0x0000000074E10000-0x00000000753C1000-memory.dmp

Filesize
5.7MB

Download
memory/1128-132-0x0000000074E10000-0x00000000753C1000-memory.dmp

Filesize
5.7MB

Download
memory/1520-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1520-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1520-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1520-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2764-136-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2764-141-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2764-155-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2764-156-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2920-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2920-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2920-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2920-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

Sharing