isrstealer | 91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926

General

Target

91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe
Size

997KB
MD5

64d8cd5887121a92d2aa2309c00e00c3
SHA1

abf3f50495acaf3e4fbc74360e8b5ab38a1b7368
SHA256

91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926
SHA512

9cc3ade34cfe3440e34a7b29348d15afea0f27c2c3348f2c4faf5839673df1d3d7bdb0f22190640da1da8301e0c088f155078e8fe587d0f1f21a804ab15757ab
SSDEEP

24576:NaTkdUWtwGN1YkacFSFto49v44GEMg6eihL7:4TSUWtwGN1Y5Lbo+44wg6n

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 5 IoCs

resource	yara_rule
behavioral2/memory/4236-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4236-138-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4236-144-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4236-149-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4236-157-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4216-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4216-155-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4216-156-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/4216-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4216-155-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4216-156-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4320-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4320-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4320-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4320-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4216-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4216-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4216-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4216-155-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4216-156-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	AppLaunch.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 672 set thread context of 4236	672	91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe	86
PID 4236 set thread context of 4320	4236	AppLaunch.exe	87
PID 4236 set thread context of 4216	4236	AppLaunch.exe	95

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	672	91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4236	AppLaunch.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 672 wrote to memory of 4236	672	91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe	86
PID 672 wrote to memory of 4236	672	91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe	86
PID 672 wrote to memory of 4236	672	91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe	86
PID 672 wrote to memory of 4236	672	91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe	86
PID 672 wrote to memory of 4236	672	91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe	86
PID 672 wrote to memory of 4236	672	91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe	86
PID 672 wrote to memory of 4236	672	91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe	86
PID 4236 wrote to memory of 4320	4236	AppLaunch.exe	87
PID 4236 wrote to memory of 4320	4236	AppLaunch.exe	87
PID 4236 wrote to memory of 4320	4236	AppLaunch.exe	87
PID 4236 wrote to memory of 4320	4236	AppLaunch.exe	87
PID 4236 wrote to memory of 4320	4236	AppLaunch.exe	87
PID 4236 wrote to memory of 4320	4236	AppLaunch.exe	87
PID 4236 wrote to memory of 4320	4236	AppLaunch.exe	87
PID 4236 wrote to memory of 4320	4236	AppLaunch.exe	87
PID 4236 wrote to memory of 4216	4236	AppLaunch.exe	95
PID 4236 wrote to memory of 4216	4236	AppLaunch.exe	95
PID 4236 wrote to memory of 4216	4236	AppLaunch.exe	95
PID 4236 wrote to memory of 4216	4236	AppLaunch.exe	95
PID 4236 wrote to memory of 4216	4236	AppLaunch.exe	95
PID 4236 wrote to memory of 4216	4236	AppLaunch.exe	95
PID 4236 wrote to memory of 4216	4236	AppLaunch.exe	95
PID 4236 wrote to memory of 4216	4236	AppLaunch.exe	95

C:\Users\Admin\AppData\Local\Temp\91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe
"C:\Users\Admin\AppData\Local\Temp\91a8fc3813c8e19960aef0b7c889dd1a10fce5888317e367f5040cca4d1dc926.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:672
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4236
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\BYbRhYIdX2.ini"
    3⤵
    PID:4320
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\aquEsWWgtb.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:4216

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\BYbRhYIdX2.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/672-133-0x0000000075270000-0x0000000075821000-memory.dmp

Filesize
5.7MB

Download
memory/672-137-0x0000000075270000-0x0000000075821000-memory.dmp

Filesize
5.7MB

Download
memory/672-132-0x0000000075270000-0x0000000075821000-memory.dmp

Filesize
5.7MB

Download
memory/4216-156-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4216-155-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4216-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4216-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4216-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4236-138-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4236-149-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4236-144-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4236-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4236-157-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4320-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4320-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4320-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4320-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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