isrstealer | 84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49

Analysis

max time kernel
206s
max time network
208s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
28-11-2022 18:24

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General

Target

84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe
Size

396KB
MD5

a8ef2d5e506116cae0588c134067e490
SHA1

3501032b5e4dce90617788656d45724379c461aa
SHA256

84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49
SHA512

15351b82a74d8131a6fa2c605c0fef357b6659d9980ee36bae2e4661dd4b688ffce23463afb75169bdbd1dac36e30ec3169e31c86cb0b1ca27b6ce774cb71938
SSDEEP

12288:1sW8WRB7+0RDWj0h349/rC7Yt4ufjkz7hZJFiUzEA52JjH:yuRJ+tj0349/CaVgHhZJpn2JL

Score

10^/10

isrstealer collection persistence 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/2204-134-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2204-136-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2204-145-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2204-159-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3520-157-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3520-158-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3520-162-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/3520-157-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3520-158-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3520-162-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1648-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1648-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1648-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1648-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3520-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3520-156-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3520-157-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3520-158-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3520-162-0x0000000000400000-0x000000000041F000-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	RegSvcs.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\xSILlzCwXBSr = "\"C:\\Users\\Admin\\AppData\\Roaming\\xSILlzCwXBSr\\xSILlzCwXBSr.exe\""	RegSvcs.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 3724 set thread context of 2204	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	82
PID 2204 set thread context of 1648	2204	RegSvcs.exe	83
PID 3724 set thread context of 5024	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	88
PID 2204 set thread context of 3520	2204	RegSvcs.exe	90

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe
3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2204	RegSvcs.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 3724 wrote to memory of 2204	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	82
PID 3724 wrote to memory of 2204	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	82
PID 3724 wrote to memory of 2204	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	82
PID 3724 wrote to memory of 2204	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	82
PID 3724 wrote to memory of 2204	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	82
PID 3724 wrote to memory of 2204	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	82
PID 3724 wrote to memory of 2204	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	82
PID 2204 wrote to memory of 1648	2204	RegSvcs.exe	83
PID 2204 wrote to memory of 1648	2204	RegSvcs.exe	83
PID 2204 wrote to memory of 1648	2204	RegSvcs.exe	83
PID 2204 wrote to memory of 1648	2204	RegSvcs.exe	83
PID 2204 wrote to memory of 1648	2204	RegSvcs.exe	83
PID 2204 wrote to memory of 1648	2204	RegSvcs.exe	83
PID 2204 wrote to memory of 1648	2204	RegSvcs.exe	83
PID 2204 wrote to memory of 1648	2204	RegSvcs.exe	83
PID 3724 wrote to memory of 2176	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	87
PID 3724 wrote to memory of 2176	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	87
PID 3724 wrote to memory of 2176	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	87
PID 3724 wrote to memory of 5024	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	88
PID 3724 wrote to memory of 5024	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	88
PID 3724 wrote to memory of 5024	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	88
PID 3724 wrote to memory of 5024	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	88
PID 3724 wrote to memory of 5024	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	88
PID 3724 wrote to memory of 5024	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	88
PID 3724 wrote to memory of 5024	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	88
PID 3724 wrote to memory of 5024	3724	84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe	88
PID 2204 wrote to memory of 3520	2204	RegSvcs.exe	90
PID 2204 wrote to memory of 3520	2204	RegSvcs.exe	90
PID 2204 wrote to memory of 3520	2204	RegSvcs.exe	90
PID 2204 wrote to memory of 3520	2204	RegSvcs.exe	90
PID 2204 wrote to memory of 3520	2204	RegSvcs.exe	90
PID 2204 wrote to memory of 3520	2204	RegSvcs.exe	90
PID 2204 wrote to memory of 3520	2204	RegSvcs.exe	90
PID 2204 wrote to memory of 3520	2204	RegSvcs.exe	90

C:\Users\Admin\AppData\Local\Temp\84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe
"C:\Users\Admin\AppData\Local\Temp\84f05dc3388e320815b9b4213746055bf5fed22e284808f262d6b2fade256a49.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3724
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2204
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\M5s2fSABO0.ini"
    3⤵
    PID:1648
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\uHPEKnklM5.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:3520
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe" /xSILlzCwXBSr /C:\Users\Admin\AppData\Roaming\xSILlzCwXBSr\xSILlzCwXBSr.exe
  2⤵
  PID:2176
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe" /xSILlzCwXBSr /C:\Users\Admin\AppData\Roaming\xSILlzCwXBSr\xSILlzCwXBSr.exe
  2⤵
  - Adds Run key to start application
  PID:5024

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\M5s2fSABO0.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1648-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1648-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1648-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1648-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2204-134-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2204-145-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2204-136-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2204-159-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3520-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3520-162-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3520-158-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3520-157-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3520-156-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3724-147-0x0000000074880000-0x0000000074E31000-memory.dmp

Filesize
5.7MB

Download
memory/3724-160-0x0000000074880000-0x0000000074E31000-memory.dmp

Filesize
5.7MB

Download
memory/3724-132-0x0000000074880000-0x0000000074E31000-memory.dmp

Filesize
5.7MB

Download
memory/5024-152-0x0000000074880000-0x0000000074E31000-memory.dmp

Filesize
5.7MB

Download
memory/5024-151-0x0000000074880000-0x0000000074E31000-memory.dmp

Filesize
5.7MB

Download
memory/5024-161-0x0000000074880000-0x0000000074E31000-memory.dmp

Filesize
5.7MB

Download
memory/5024-150-0x0000000000400000-0x0000000000408000-memory.dmp

Filesize
32KB

Download